
Co-sleeping with a four-month-old baby can be beneficial for breastfeeding and bonding, but it is important to do so safely. The American Academy of Pediatrics recommends room-sharing without bed-sharing, as bed-sharing increases the risk of sleep-related deaths, including SIDS, especially in preterm infants, babies with low birth weight, and healthy full-term infants younger than four months old. If you choose to co-sleep, it is important to reduce risks by ensuring your baby sleeps on their back on a firm, flat, and level surface, in a smoke-free environment, with no pillows, bedding, or bulky items that could cover their head and face. Additionally, adults should be non-smokers, sober, and unimpaired to ensure they are responsive to the baby's needs.
| Characteristics | Values |
|---|---|
| Sleeping arrangement | Co-sleeping on the same surface |
| Recommended by | American Academy of Pediatrics |
| Recommended for | At least the first six months of life |
| Risks | Increased risk of sleep-related deaths, including SIDS |
| Safe co-sleeping practices | Baby should sleep on their back, on a firm, flat, and level surface, in a clear, smoke-free, and not too hot environment |
| Unsafe practices | Co-sleeping when the baby is younger than 4 months old, preterm, or has a low birth weight; co-sleeping while under the influence of drugs or alcohol; co-sleeping on a soft mattress, sofa, or recliner |
| Alternatives | Room-sharing without bed-sharing; using a separate mattress or a bassinet, play yard, or crib next to the bed |
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What You'll Learn

Place your baby on their back to sleep
When co-sleeping with your four-month-old baby, it is important to place them on their back to sleep. This is true for both naps and at night. Sleeping on the back is the safest sleep position for babies and will help to protect their airways. It is recommended that babies sleep on their backs from the moment they are born until they are one year old.
Placing your baby on their back to sleep reduces the risk of sudden infant death syndrome (SIDS) and other sleep-related deaths. Research has shown that putting a baby to sleep on their stomach or side increases the risk of SIDS by up to 45 times. Side sleeping is not recommended because it is unstable, and babies who are placed on their sides are more likely to fall onto their stomachs, the position associated with the highest risk of SIDS.
To encourage your baby to sleep on their back, you can try giving them a pacifier when you put them down to sleep. The sucking motion can be soothing, and it is harder for babies to keep pacifiers in their mouths if they roll onto their tummies or sides. You can also rock your baby until they are drowsy and then transfer them to their crib on their back. Consistency is key when it comes to sleep routines, so even if it takes time and persistence, your baby will eventually get used to sleeping on their back.
When co-sleeping with your baby, it is important to follow additional safety guidelines to reduce the risk of SIDS and other sleep accidents. Make sure your baby sleeps on a firm, flat, and level surface, in a clear space that is not too hot and smoke-free. Keep your baby's head and face uncovered by keeping pillows and adult bedding away from them. Avoid co-sleeping if you or your partner smoke or consume alcohol or drugs that make you less aware and able to respond to your baby.
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Avoid bed-sharing if your baby is younger than 4 months old
Bed-sharing is not recommended for babies younger than four months old due to the risk of sudden infant death syndrome (SIDS) and accidental suffocation or strangulation. Bed-sharing increases the risk of sleep-related deaths, including SIDS, and babies under four months old are considered to be at the greatest risk of SIDS if bed-sharing.
Research indicates that bed-sharing with a healthy baby on a safe surface is only as safe as any other sleep arrangement once the baby is about four months old. Before this age, it is recommended that babies sleep in the same room as their parents but on a separate sleep surface, such as a crib or bassinet. This arrangement allows for easy access for feeding and comforting while reducing the risks associated with bed-sharing.
If bed-sharing is unavoidable or preferred by the parents of a baby younger than four months old, there are some precautions that can be taken to reduce the risks. Firstly, ensure that all sleep surfaces and products have been approved by the CPSC and meet federal safety standards. Additionally, the baby should be placed on their back to sleep, dressed in minimal clothing to avoid overheating, and offered a pacifier at sleep time. It is also important to avoid bed-sharing if the baby was born prematurely or with a low birth weight, as these factors further increase the risk of SIDS.
It is crucial for parents to carefully consider the risks and benefits of bed-sharing and prioritize the safety of their baby when making decisions about sleep arrangements. While bed-sharing can provide benefits such as increased bonding and convenience, the potential risks to the baby's health and safety must be taken into account, especially for infants younger than four months old.
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Avoid bed-sharing if you or your partner smoke
The safest place for a baby to sleep is in their own safe sleep space, and co-sleeping is not recommended. However, if you do choose to co-sleep, it is important to know how to do so safely.
If you or your partner smoke, it is advised that you avoid bed-sharing with your four-month-old baby. Smoking increases the risk of Sudden Infant Death Syndrome (SIDS) and other sleep accidents. The risk of SIDS is already heightened for babies under three months old, and the presence of smoking further enhances this risk.
If you choose to co-sleep, it is important to take steps to reduce the risks. Place your baby on their back on a firm, flat, and level surface, away from the edge of the bed and next to only one parent. Keep the baby's head and face uncovered by keeping pillows, blankets, and adult bedding away. Use a safe sleeping bag with arms out and avoid wrapping or swaddling the baby. Ensure the sleep space is big enough for everyone and move the mattress away from walls and other furniture to prevent the baby from becoming trapped.
It is important to be aware of other risk factors for SIDS when considering bed-sharing. These include alcohol or drug use, formula feeding, and preterm or low birth weight babies. By avoiding these risk factors and creating a safe sleep environment, you can help to reduce the chances of SIDS and other sleep accidents when co-sleeping with your baby.
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Keep your baby's head and face uncovered
While co-sleeping with a four-month-old baby is not recommended, it is possible to do so safely. Keeping your baby's head and face uncovered is one of the most important precautions to take when co-sleeping. This means ensuring that no pillows, blankets, or other bedding can cover your baby's head or face, restricting their breathing.
To keep your baby's head and face uncovered, place them on their back to sleep, not on their side or tummy. This will help to keep their airways open and reduce the risk of Sudden Infant Death Syndrome (SIDS) and other sleep accidents. Make sure all pillows and adult bedding are kept away from the baby. Use a safe sleeping bag with no hood and with your baby's arms out, rather than wrapping or swaddling them.
It is also important to consider the sleep surface when co-sleeping. Choose a firm, flat, and level mattress, and ensure the sleep space is big enough for everyone, with a clear area around your baby. Move the mattress away from walls and other furniture to prevent your baby from becoming trapped, and consider placing the mattress on the floor to avoid the risk of your baby falling or rolling off the bed.
Additionally, it is recommended that parents avoid co-sleeping if they or their partner smoke, consume alcohol, or take drugs or medication that causes heavy sleep or reduces awareness. These factors can increase the risk of SIDS and other sleep accidents.
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Make sure your mattress is firm, flat and level
If you are co-sleeping with your four-month-old, it is important to make sure your mattress is firm, flat, and level. This is because a soft mattress can be unsafe for your baby. A firm mattress reduces the risk of your baby sinking into it, which can restrict their breathing. A firm, flat, and level mattress also helps to keep your baby's airways open and reduces the risk of sudden unexpected infant death (SUID).
Make sure there is no bulky bedding in the cot or bed, and that all pillows and adult bedding are kept away from the baby. This will help to prevent your baby from getting trapped under heavy blankets or having their airways blocked by pillows. It is also important to ensure that the mattress is the right size for the cot or bed. There should be enough space for everyone sleeping there, with a clear area around your baby. If the sleep space is not big enough, consider alternatives such as using a separate mattress for older children or moving the mattress to the floor if there is a risk of your baby rolling off the bed.
Additionally, the mattress should be clean and positioned away from any potential hazards, such as hanging cords, blinds, or electrical items. By following these precautions, you can help to create a safe sleeping environment for your four-month-old while co-sleeping.
It is worth noting that co-sleeping is not recommended by some sources due to the potential risks involved. However, if you choose to co-sleep, it is important to take the necessary precautions to ensure your baby's safety.
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Frequently asked questions
Co-sleeping is not recommended by many health organizations due to the risk of SIDS, but research has shown that the risk of bedsharing can be managed when done safely.
Co-sleeping increases the risk of sleep-related deaths, including SIDS, especially in preterm infants, babies with low birth weight, and healthy full-term infants younger than 4 months old.
To reduce the risks of co-sleeping, ensure your baby sleeps on their back on a firm, flat, and level surface, in a smoke-free environment, and avoid bedding that could cover their head and face.
Co-sleeping can help regulate a baby's heart rate, brain waves, sleep states, oxygen levels, temperature, and breathing. It can also help babies feel secure and manage stress. Additionally, caregivers don't have to get out of bed to feed the baby.
Instead of co-sleeping, you can room-share by placing your baby in a bassinet, play yard, or crib next to your bed, providing closeness and easy access for breastfeeding.











































