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Should newborns sleep on their back or stomach? Lets find out!

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February 8, 2026

Should newborns sleep on their back or stomach? Lets find out!

Should newborns sleep on their back or stomach? This question pops up in every new parent’s mind, and for good reason! It’s a critical decision that directly impacts a baby’s safety and well-being. The world’s medical community has a clear stance, backed by research and countless parental experiences, on how to keep your little one safe while they catch those Zzz’s.

Get ready to dive into the world of baby sleep positions, where we’ll unpack the science, the safety measures, and everything in between.

We’ll start with the global consensus and why the “Back to Sleep” campaign is so important. Then, we’ll explore the risks associated with tummy time and the potential dangers that could come with it. We’ll also look at side sleeping, weighing its pros and cons, and examining the factors that influence how a baby should sleep. Plus, we’ll talk about medical conditions that might require a different approach, how to keep an eye on your little one, and address those common worries parents have.

The Current Recommendations

As we continue our exploration of safe sleep practices for newborns, it’s essential to understand the cornerstone of current recommendations: the emphasis on back sleeping. This approach has significantly impacted infant mortality rates and is a key factor in ensuring a safe and healthy start for every baby.

Global Consensus on Infant Sleep Position

The overwhelming consensus among healthcare professionals and organizations worldwide is that infants should sleep on their backs, also known as the supine position, for every sleep, including naps. This recommendation is based on extensive research and a deep understanding of the risks associated with other sleep positions. The “Back to Sleep” campaign, initiated to promote this practice, has become a global standard.

Rationale Behind Recommending Back Sleeping

The primary rationale behind recommending back sleeping is to reduce the risk of Sudden Infant Death Syndrome (SIDS). Research indicates that sleeping on the stomach or side increases this risk. When babies sleep on their backs, their airways are less likely to be obstructed, and they have better access to fresh air. The supine position also allows for easier expulsion of any fluids, such as milk, that the baby might regurgitate.The benefits of back sleeping are numerous, supported by scientific evidence:

  • Reduced Risk of SIDS: Studies consistently show a strong correlation between back sleeping and a decreased risk of SIDS.
  • Improved Airway Management: Back sleeping allows for better airflow and reduces the chances of airway obstruction.
  • Easier Breathing: In the supine position, the baby’s chest and abdomen can expand more freely, facilitating easier breathing.

Organizations That Endorse the “Back to Sleep” Campaign

Numerous reputable organizations worldwide endorse the “Back to Sleep” campaign and provide guidelines for safe infant sleep. These organizations base their recommendations on extensive research and evidence-based practices. Some of the most prominent include:

  • The American Academy of Pediatrics (AAP): The AAP is a leading authority on pediatric health and strongly recommends back sleeping. They regularly update their safe sleep guidelines based on the latest research.
  • The National Institutes of Health (NIH): The NIH supports research related to SIDS and other infant health issues and actively promotes safe sleep practices, including back sleeping.
  • The Centers for Disease Control and Prevention (CDC): The CDC provides comprehensive information on infant health and safety, including clear guidelines on back sleeping.
  • World Health Organization (WHO): The WHO advocates for safe sleep practices globally, including the recommendation for infants to sleep on their backs.

These organizations and many others worldwide consistently emphasize the importance of back sleeping to reduce the risk of SIDS and promote infant safety.

Risks Associated with Stomach Sleeping

Should newborns sleep on their back or stomach? Lets find out!

Hey there, new parents and caregivers! We’ve already talked about the importance of back sleeping for newborns, but let’s dive deeper into why tummy time, while crucial for development, isn’t the safest position for sleep. Understanding the potential risks associated with stomach sleeping is key to ensuring your little one’s safety and peace of mind. Let’s explore the dangers and what you can do to protect your baby.

Potential Dangers of Prone Sleeping for Newborns

Sleeping on their stomach, also known as prone sleeping, poses several dangers for newborns. Their underdeveloped muscles and airways, combined with their inability to move freely, can lead to serious complications. This position can obstruct breathing and increase the risk of overheating.

Link Between Stomach Sleeping and Sudden Infant Death Syndrome (SIDS)

The link between stomach sleeping and Sudden Infant Death Syndrome (SIDS) is well-established. SIDS is the unexplained death of an infant, usually during sleep. Research consistently shows a significantly higher incidence of SIDS in babies who sleep on their stomachs compared to those who sleep on their backs. This correlation is a major reason why healthcare professionals strongly recommend back sleeping.

Mechanisms by Which Stomach Sleeping Might Increase SIDS Risk

Several factors contribute to the increased risk of SIDS when a baby sleeps on their stomach.

  • Airway Obstruction: When a baby sleeps prone, their face can press against the mattress, potentially obstructing their airways. This can lead to a decrease in oxygen levels and an increase in carbon dioxide levels, making it harder for the baby to breathe.
  • Rebreathing Exhaled Air: In the stomach-sleeping position, a baby may rebreathe the air they have already exhaled. This air has less oxygen and more carbon dioxide, further compromising their breathing.
  • Overheating: Prone sleeping can contribute to overheating, another risk factor for SIDS. Babies sleeping on their stomachs may become too warm, especially if they are overdressed or in a warm environment.
  • Impaired Arousal: Babies sleeping on their stomachs may have a harder time waking up or changing positions if they experience breathing difficulties. This impaired arousal response is believed to be a contributing factor in some SIDS cases.

Comparison of Risks: Stomach Sleeping vs. Back Sleeping

To further illustrate the risks, here’s a comparison table:

Potential Hazard Severity Preventative Measures
Airway Obstruction High – Can lead to suffocation Always place baby on their back to sleep. Ensure the crib mattress is firm and flat.
Rebreathing Exhaled Air Moderate – Can lead to decreased oxygen levels Avoid soft bedding, pillows, and loose blankets in the crib. Use a sleep sack or wearable blanket.
Overheating Moderate – Increases SIDS risk Dress baby in light layers. Keep the room at a comfortable temperature (around 68-72°F or 20-22°C).
Impaired Arousal High – Can prevent baby from waking up to breathe Follow safe sleep guidelines, including back sleeping. Avoid swaddling after the baby shows signs of rolling over.

Benefits and Concerns of Side Sleeping

Should newborns sleep on their back or stomach

Navigating the world of infant sleep positions can feel like a tightrope walk. We’ve explored the importance of back sleeping and the dangers of stomach sleeping. Now, let’s turn our attention to side sleeping. While it might seem like a middle ground, side sleeping presents its own set of advantages and disadvantages, along with crucial safety considerations that parents need to understand.

Advantages, Disadvantages, and Safety Considerations of Side Sleeping, Should newborns sleep on their back or stomach

The side sleeping position, sometimes considered as a potential alternative to back sleeping, requires careful evaluation. While it may appear to offer some benefits, it also introduces certain risks. Understanding these aspects is crucial for making informed decisions about your newborn’s sleep environment. Let’s delve into the specifics.

Advantages

Some proponents of side sleeping have suggested it might offer benefits. However, it’s essential to understand that the evidence supporting these advantages is limited and often overshadowed by safety concerns.

  • Potential for Easier Breathing: Theoretically, side sleeping might help if a baby has minor congestion, as it could help drain mucus more effectively than back sleeping.
  • Possible Reduction of Reflux: Some parents believe that side sleeping may reduce the likelihood of reflux.

Disadvantages

The disadvantages of side sleeping are significant and directly impact the safety of the infant.

  • Increased Risk of Rolling Over: Infants can easily roll from the side position onto their stomach, which significantly increases the risk of Sudden Infant Death Syndrome (SIDS). This transition is often unnoticed by parents, especially during the night.
  • Instability: The side position is inherently less stable than the back position. The infant can more easily shift, potentially leading to airway obstruction.
  • Limited Scientific Support: There is a lack of substantial scientific evidence supporting the benefits of side sleeping, especially when weighed against the increased risk of SIDS.

Safety Considerations

Given the inherent risks, specific safety precautions must be considered if a parent chooses side sleeping, though this is not the recommended position.

  • Risk Mitigation: If side sleeping is chosen, the infant must be closely monitored. Frequent checks are essential to ensure the baby remains in the intended position and does not roll over.
  • Not Recommended by Experts: Healthcare professionals and organizations like the American Academy of Pediatrics (AAP) do not recommend side sleeping due to the elevated SIDS risk. The AAP consistently recommends placing infants on their backs to sleep.
  • Use of Positioning Aids: The use of pillows or other positioning aids to maintain the side position is not recommended, as these can pose a suffocation hazard.

Factors Influencing Infant Sleep Position: Should Newborns Sleep On Their Back Or Stomach

Choosing the right sleep position for your newborn is a crucial decision that can significantly impact their safety and well-being. Understanding the various factors that influence infant sleep and how to create a safe sleep environment is paramount for every parent and caregiver. This section delves into creating a safe haven for your baby during sleep, focusing on key elements that promote safety and minimize risks.

Creating a Safe Sleep Environment for Newborns

Creating a safe sleep environment is more than just placing a baby in a crib; it’s about minimizing hazards and maximizing safety. This involves careful consideration of the sleep surface, bedding, and surrounding items. Prioritizing these elements can significantly reduce the risk of Sudden Infant Death Syndrome (SIDS) and other sleep-related dangers.

Importance of a Firm, Flat Sleep Surface

A firm, flat sleep surface is the cornerstone of safe infant sleep. This is because a firm surface prevents the baby’s face from sinking into the mattress, reducing the risk of suffocation if the baby rolls over. Soft surfaces, on the other hand, can conform to the baby’s shape, potentially obstructing their airways.

Dangers of Soft Bedding, Pillows, and Loose Items in the Crib

Soft bedding, pillows, and loose items pose significant risks in a baby’s crib. These items can increase the risk of suffocation, strangulation, and entrapment. It’s crucial to eliminate anything that could potentially cover the baby’s face or obstruct their breathing.

Ideal Crib Setup

The ideal crib setup prioritizes safety and minimizes risks. This includes a firm, flat mattress, a fitted sheet, and an uncluttered environment. The following table illustrates the components of an ideal crib setup, detailing their purpose and safety features:

Component Purpose Safety Features
Firm, Flat Mattress Provides a stable and supportive sleep surface. Prevents the baby’s face from sinking into the mattress, reducing the risk of suffocation. Meets current safety standards for crib mattresses.
Fitted Sheet Covers the mattress and provides a clean sleep surface. Should fit snugly and securely over the mattress to prevent bunching or coming loose. Made of breathable material.
Bare Crib (No other items) Provides a clear and uncluttered sleep space. Eliminates hazards like pillows, blankets, stuffed animals, and bumpers that could pose suffocation or strangulation risks.
Crib Placement Ensures the crib is positioned safely. The crib should be away from windows, cords, and other potential hazards. Ensure the crib meets all current safety standards and has no recalled components.

Medical Conditions and Sleep Position

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Knowing the optimal sleep position for newborns is crucial, but it’s equally important to understand that certain medical conditions may necessitate adjustments to this standard advice. While back sleeping is generally recommended, specific health issues can influence a doctor’s recommendations. Let’s delve into how medical conditions and sleep positions intersect to ensure the safest sleep environment for your baby.

Medical Conditions Requiring Sleep Position Adjustments

Several medical conditions can influence the sleep position recommended by a pediatrician. These adjustments aim to alleviate symptoms, promote healing, and minimize risks. It’s essential to always consult with a healthcare professional regarding your baby’s specific needs.

  • Gastroesophageal Reflux (GERD): Babies with GERD may experience frequent spitting up, vomiting, and discomfort. In some cases, a doctor might recommend a slightly elevated sleep position or side sleeping to reduce the risk of aspiration.
  • Obstructive Sleep Apnea (OSA): Babies with OSA, characterized by pauses in breathing during sleep, might benefit from a sleep position that helps keep their airways open.
  • Craniofacial Abnormalities: Certain conditions affecting the skull and facial structure may influence sleep position recommendations.
  • Congenital Heart Defects: Some heart conditions might require specific positioning to optimize breathing and circulation.

Situations Where Doctors Recommend Different Sleep Positions

Doctors carefully evaluate each baby’s health and medical history before making sleep position recommendations. Several factors contribute to their decision-making process.

  • Severity of the Condition: The intensity of the medical condition significantly influences the recommended sleep position. Mild reflux may require different adjustments than severe cases.
  • Individual Baby’s Symptoms: The specific symptoms a baby experiences, such as the frequency of spitting up or breathing difficulties, guide the doctor’s recommendations.
  • Underlying Medical Conditions: The presence of other health issues, such as allergies or asthma, can also affect the decision.
  • Overall Health and Development: The baby’s general health, including weight gain and developmental milestones, is considered.

Implementing Alternative Sleep Positions Safely Under Medical Supervision

When a doctor recommends a sleep position other than back sleeping, it’s crucial to follow their instructions precisely. This ensures safety and maximizes the benefits of the adjusted position. It’s vital to prioritize safe sleep practices, even with alternative positions.

  • Follow Doctor’s Instructions: Adhere to the specific sleep position and any additional recommendations provided by the healthcare provider.
  • Supervision: Always supervise the baby, especially when trying a new sleep position.
  • Safe Sleep Environment: Maintain a safe sleep environment by using a firm, flat sleep surface, and removing all soft bedding, toys, and pillows from the crib.
  • Regular Check-ins: Schedule regular follow-up appointments with the doctor to monitor the baby’s progress and adjust the sleep position as needed.
  • Use of Aids (If Recommended): If the doctor suggests using a wedge or other positioning aids, ensure they are specifically designed for infant sleep and used according to the manufacturer’s instructions.

Here’s an example of a doctor’s recommendation for a baby with reflux:

“Based on your baby’s frequent spitting up and discomfort, I recommend placing him on his side to sleep, slightly elevated. This position helps gravity keep the stomach contents down and reduces the risk of aspiration. Always ensure the baby is supervised, and use a firm, flat mattress. We will reassess this position at your next check-up to ensure it’s effective and safe.”

This recommendation highlights the doctor’s concern for the baby’s symptoms (frequent spitting up and discomfort) and the rationale behind the recommendation (gravity and aspiration risk). The doctor also emphasizes the need for supervision and regular follow-up.

Monitoring and Observation Techniques

As parents, ensuring your newborn’s safety during sleep is paramount. Regular monitoring and observation are crucial components of safe sleep practices. This section provides guidance on how to observe your baby, check their well-being, and understand the role of baby monitors.

Observing Your Baby During Sleep

Consistent observation of your baby while they sleep allows you to quickly identify any potential issues and ensures they are resting comfortably.

  • Regular Checks: Perform frequent visual checks. Ideally, observe your baby every time you pass their sleeping area, or at least every hour, especially during the first few months. This includes during naps and overnight sleep.
  • Observe for Color and Breathing: Look for the baby’s skin color. A healthy baby will have a pink or slightly flushed complexion. Observe the chest for the rise and fall of breathing. Ensure the baby’s breathing is regular and not labored.
  • Check for Position: Confirm the baby remains in the recommended back-sleeping position.
  • Listen for Sounds: Pay attention to the baby’s breathing sounds. Snoring, wheezing, or unusual noises might warrant further investigation.
  • Environment Assessment: Ensure the sleep environment remains safe. Check for any loose bedding or objects that could pose a hazard.

Checking the Baby’s Breathing and Overall Well-being

Assessing your baby’s breathing and overall well-being is a key part of safe sleep monitoring.

  • Breathing Rate: A newborn’s breathing rate typically ranges from 30 to 60 breaths per minute. Observe the baby’s chest rising and falling. Count the number of breaths over a minute to get an accurate assessment. If you are concerned, consult your pediatrician.
  • Breathing Sounds: Listen for any unusual sounds. Occasional grunting or sighing can be normal, but persistent wheezing, stridor (a high-pitched whistling sound), or gasping can indicate breathing difficulties.
  • Skin Color: A healthy baby should have a pink or slightly flushed skin tone. Observe for signs of cyanosis (bluish discoloration) around the lips, mouth, and nail beds, which indicates a lack of oxygen and requires immediate medical attention.
  • Activity Level: A baby who is awake and alert should be active and responsive. A baby who is lethargic or unresponsive should be evaluated by a healthcare professional.
  • Feeding and Elimination: Note the baby’s feeding habits and the frequency of wet and dirty diapers. These are good indicators of overall health.

Use of Baby Monitors and Their Limitations

Baby monitors can provide added peace of mind, but it is important to understand their limitations.

  • Types of Monitors:
    • Audio Monitors: These transmit sound, allowing you to hear your baby’s cries or noises.
    • Video Monitors: These offer visual and audio monitoring, allowing you to see and hear your baby.
    • Movement Monitors: These are designed to detect movement and alert parents if movement stops for a certain period.
  • Limitations:
    • False Alarms: Movement monitors can sometimes trigger false alarms.
    • Technology Dependence: Relying solely on a monitor can reduce hands-on observation.
    • Not a Substitute for Safe Sleep Practices: Monitors should supplement, not replace, adherence to safe sleep guidelines.
  • Placement: Place monitors safely away from the baby’s sleep area. Follow the manufacturer’s instructions.
  • Battery Backup: Ensure the monitor has a battery backup in case of power outages.

Illustrations of Correct Sleep Positioning

Illustrations demonstrating the proper sleep position are essential for understanding safe sleep practices.

Illustration 1: Correct Back Sleeping Position

Imagine a drawing of a baby lying on their back in a crib. The baby’s head is gently turned to one side. The arms are resting alongside the body, and the legs are extended. The baby’s face is visible, and the crib is free of any blankets, pillows, or toys. The mattress is firm and flat, covered with a fitted sheet.

Illustration 2: Incorrect Stomach Sleeping Position

Imagine a drawing of a baby lying on their stomach in a crib. The baby’s face is turned to one side, but the baby is facing down, potentially obstructing their airway. The baby’s arms are either under the body or next to it, and the legs are extended. The crib is free of blankets, pillows, or toys, but the image conveys a dangerous sleeping environment.

The gentle curve of a newborn’s spine dictates their slumber, ideally on their back. A mother’s intuition shifts during pregnancy, as the body changes, one wonders about comfort, especially regarding positions. Eventually, you’ll be pondering how long can you sleep on your belly while pregnant. Yet, once that precious life arrives, the focus returns: ensuring the safest sleep position for the tiny, fragile form, always on the back.

Illustration 3: Correct Sleep Posture

Imagine a drawing of a baby sleeping on their back, as described in Illustration 1. The baby’s face shows relaxed features, and the body is in a neutral position. The baby is not swaddled tightly, allowing for some movement of the arms and legs. The baby is wearing a sleep sack. The illustration highlights the importance of a clear airway and a safe sleep environment.

Addressing Parental Concerns and Misconceptions

It’s completely normal for parents to have questions and worries about their newborn’s sleep, especially when it comes to something as crucial as sleep position. The sheer amount of information available, and the varying advice given, can understandably lead to confusion and anxiety. This section aims to address these concerns head-on, providing clear, evidence-based information to help alleviate anxieties and promote safe sleep practices.

We’ll delve into common worries, debunk myths, and offer practical advice to empower parents with the knowledge they need.

Common Concerns about Back Sleeping

Many parents express concerns about back sleeping, often stemming from a misunderstanding of the risks and benefits. These concerns are often fueled by outdated information or a lack of understanding of the scientific evidence. Addressing these anxieties with factual information is essential.

  • Choking or Vomiting: One of the most common fears is that a baby sleeping on their back will choke if they vomit. Parents worry that the vomit will pool in the back of the throat and obstruct the airway.
  • Flat Head Syndrome (Positional Plagiocephaly): Parents are concerned about the development of flat spots on the baby’s head due to prolonged time spent lying on their back.
  • Difficulty Sleeping: Some parents worry that babies won’t sleep as soundly or comfortably on their backs, leading to increased wakefulness and potential sleep deprivation for both baby and parents.
  • Suffocation from Spit-up: A related concern is that spit-up will somehow suffocate the baby, even though the airway is designed to protect against this.

Identifying Common Misconceptions Regarding Sleep Positions

Misinformation about infant sleep positions is widespread, often leading to unsafe practices. Correcting these misconceptions is vital for infant safety.

  • Stomach Sleeping Promotes Better Sleep: This is a dangerous misconception. While some babies may initially sleep longer on their stomachs, the increased risk of SIDS far outweighs any perceived benefit.
  • Side Sleeping is a Safe Alternative to Back Sleeping: Side sleeping is considered more hazardous than back sleeping and carries a higher risk of the baby rolling onto their stomach.
  • If a Baby Rolls Over, It’s Safe: While it’s true that once a baby can consistently roll over on their own, it’s generally safe to let them remain in the position they choose, it’s still safest to initially place them on their back.
  • Swaddling Prevents SIDS: While swaddling can help a baby sleep, it’s crucial to ensure it’s done correctly. Swaddling too tightly or using loose blankets can increase the risk of SIDS.
  • Back Sleeping Always Leads to Flat Head Syndrome: While back sleeping can increase the risk, it is not the only cause. Tummy time and repositioning the baby can mitigate this risk.

Providing Advice on Addressing Concerns and Misconceptions

Open communication, education, and access to reliable resources are key to addressing parental concerns. Healthcare providers play a crucial role in providing accurate information and support.

  • Educate Parents: Explain the scientific evidence supporting back sleeping and the risks associated with other positions. Use clear, easy-to-understand language.
  • Demonstrate Safe Sleep Practices: Show parents how to create a safe sleep environment, including a firm, flat sleep surface and a bare crib.
  • Address Choking Concerns: Reassure parents that babies have a gag reflex that helps prevent choking. Explain that even if a baby vomits while on their back, they are likely to turn their head to the side, allowing the vomit to drain.
  • Encourage Tummy Time: Emphasize the importance of supervised tummy time to help strengthen neck muscles and prevent flat head syndrome. Start with short periods and gradually increase the duration.
  • Offer Support and Resources: Provide parents with reliable resources, such as the American Academy of Pediatrics (AAP) guidelines, and offer ongoing support to address any remaining concerns.

FAQs about Infant Sleep Positions

Addressing common questions with clear, concise answers can help parents feel more confident about their choices. Here are some frequently asked questions and their answers.

  • Why is back sleeping the safest position? Back sleeping significantly reduces the risk of Sudden Infant Death Syndrome (SIDS) compared to stomach or side sleeping. Studies have consistently shown this link.
  • What if my baby rolls over onto their stomach? If your baby rolls over on their own, it’s generally safe to leave them in that position. However, always place them on their back to sleep initially.
  • How can I prevent flat head syndrome? Encourage supervised tummy time throughout the day. Reposition your baby’s head during sleep and playtime. Consider using a pillow designed for this purpose, after consulting with your pediatrician.
  • What if my baby spits up while sleeping on their back? Babies have a gag reflex that protects their airway. They are likely to turn their head to the side, allowing the spit-up to drain.
  • Is side sleeping safer than stomach sleeping? No. Side sleeping is not recommended as it carries a higher risk of the baby rolling onto their stomach.
  • What about using a sleep positioner? Sleep positioners are not recommended, as they can increase the risk of SIDS.
  • When can I stop worrying about sleep position? Continue placing your baby on their back to sleep until they are at least one year old.
  • What is the ideal sleep surface? A firm, flat surface, such as a crib mattress, is ideal. Avoid soft bedding, pillows, and bumpers.

Final Thoughts

So, there you have it! The journey through the world of newborn sleep positions is a mix of science, safety, and a whole lot of love. Remember, the safest sleep position is on their back, but always consult your pediatrician if you have any concerns. Prioritizing a safe sleep environment, being informed, and trusting your instincts are key to giving your baby the best start.

Sweet dreams, little ones, and happy parenting!

Essential Questionnaire

Is it okay to let my baby sleep on their side?

Side sleeping isn’t generally recommended because babies can easily roll onto their tummies. While it might seem like a good compromise, the risk of SIDS is still higher compared to back sleeping. It’s best to stick to back sleeping unless your pediatrician advises otherwise.

What if my baby spits up while sleeping on their back?

Spitting up is common in babies, and back sleeping is still the safest position, even if they spit up. The risk of choking is actually higher in a tummy-sleeping position. If your baby spits up, gently wipe their face and check that they’re breathing comfortably. If you’re concerned, consult your doctor.

How can I tell if my baby is breathing okay while sleeping?

Watch for gentle chest movements as your baby breathes. You can also listen for the sound of their breathing. Baby monitors can also provide reassurance, but they aren’t a replacement for proper safe sleep practices. If you’re ever worried, don’t hesitate to check on your baby frequently.

When can I stop worrying about sleep position?

As your baby gets older and can roll over independently (usually around 4-6 months), the risk of SIDS decreases. However, it’s still recommended to place them on their back to sleep until they are at least 1 year old. If they roll over during sleep, you don’t need to reposition them, but always ensure a safe sleep environment.

What’s the best mattress for my baby’s crib?

A firm, flat mattress is essential for a safe sleep environment. It should fit snugly in the crib, with no gaps around the edges. Avoid soft mattresses, waterbeds, or anything that could indent under your baby’s weight, as these can increase the risk of SIDS.