
When it comes to putting a four-month-old baby to sleep, there are several factors to consider to ensure their safety and comfort. It is important to maintain a neutral temperature for the baby, avoiding both overheating and chilling. The ideal room temperature is between 68° and 72°F, and the baby's clothing should be adjusted accordingly. Loose items and clothing, such as hats, blankets, pillows, and stuffed animals, should be avoided to reduce the risk of sudden infant death syndrome (SIDS) and suffocation. Instead, opt for snug-fitting clothing made from lightweight and breathable fabrics, such as cotton or muslin. A swaddle or sleep suit can provide warmth and security, and it is recommended to place the baby on their back with their feet at the rear end of the cot. Sharing a room with the baby is recommended, but sharing a bed is not, as it can increase the risk of SIDS.
| Characteristics | Values |
|---|---|
| Number of layers | One or two fitted layers. One additional layer than an adult would wear in the same environment. |
| Type of clothing | Onesies, footed pajamas, sleep sacks, swaddle, sleep suits, sleep bags, long pajamas, lightweight, breathable fabrics. |
| Headwear | No hats, hoods, or any type of head covering. |
| Room temperature | Between 68° and 72°F. |
| Sleeping position | On their back, in their own crib or bassinet, in the same room as the parent. |
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What You'll Learn

Dressing your baby for the temperature
When it comes to dressing your baby for sleep, the most important consideration is temperature. Overheating has been linked to a greater risk of Sudden Infant Death Syndrome (SIDS), so it's important to ensure your baby is dressed appropriately for the temperature of their sleeping environment.
The ideal room temperature for a baby is between 68° and 72°F. If your home is outside of this range, you may need to adjust your baby's clothing accordingly. As a general rule of thumb, you can dress your baby in one additional layer than you would wear yourself. So, if you're wearing a t-shirt and a sheet, your baby might wear a onesie and a lightweight swaddle or sleep sack. Alternatively, in colder temperatures, you might need to add a wearable blanket or sleep sack. It's important to avoid loose items or clothing, such as hats, mittens, or blankets, as these can be unsafe for sleeping babies. Instead, opt for snug-fitting clothing to reduce the risk of suffocation.
When dressing your baby for sleep, it's important to monitor their temperature to prevent overheating or chilling. Check their face for redness and place a hand on their chest or the back of their neck to gauge their body temperature. If they feel too hot, remove a layer. If they feel too cold, add an extra layer. It's normal for a baby's hands and feet to be cold, so don't use these as indicators of their overall temperature. Instead, focus on their core temperature.
As your baby grows and becomes more active, you may need to adjust their sleepwear. For example, once they start pulling up and standing, you may need to transition to an arms-free sleeping position and avoid swaddling. Additionally, as your baby reaches the 9-month mark, you may want to consider flame-resistant pajamas, although some pediatricians question the potential health effects of the chemicals used.
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Avoiding loose clothing and blankets
When putting your 4-month-old baby to sleep, it is important to avoid loose clothing and blankets. Loose items in the crib, such as blankets, soft mattresses, pillows, and other bedding, can increase a baby's risk of sudden infant death syndrome (SIDS) and accidental suffocation. According to the American Academy of Pediatrics (AAP), soft objects can obstruct an infant's nose and mouth, blocking their airways and leading to suffocation or SIDS.
To avoid these risks, it is recommended to keep your baby's crib free from loose items and extra bedding. Instead of using loose blankets, you can use a wearable sleep sack or dress your baby in layers to keep them warm. It is generally recommended to dress your baby in one additional layer than you would wear yourself, but it is important to avoid overdressing them, as overheating has also been linked to an increased risk of SIDS.
When dressing your baby for sleep, avoid loose clothing and accessories such as hats, mittens, hair bows, and pacifier clips. These items can pose a risk of suffocation or strangulation if they cover your baby's face or wrap around their neck. It is also important to note that babies should not wear hats to sleep, as they can inhibit their ability to self-regulate their temperature by releasing heat through their head, leading to potential overheating.
Additionally, be mindful of the room temperature and adjust your baby's clothing accordingly. The ideal room temperature for a baby's sleep is between 68° and 72°F. If the room is too warm, opt for lightweight, breathable sleep clothes. If it's colder, you can add an extra layer, such as long pajamas or a heavier sleep sack, but be careful not to overdress your baby.
By following these guidelines and avoiding loose clothing and blankets, you can help create a safe sleep environment for your 4-month-old baby and reduce the risk of SIDS and accidental suffocation.
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Using sleep sacks and swaddling
When putting your baby to sleep, it is important to ensure that they are dressed appropriately to maintain their ideal body temperature. Overheating has been linked to a greater risk of Sudden Infant Death Syndrome (SIDS), while too-cold temperatures can be dangerous and uncomfortable. The ideal room temperature is between 68° and 72°F.
Sleep sacks and swaddling are two popular options for keeping babies warm while they sleep. Sleep sacks are wearable blankets that can provide warmth and comfort for babies. They are designed to fit snugly around newborns, eliminating the risk of them wriggling down or pulling it over their heads. Sleep sacks allow infants to move their arms and legs freely, promoting proper hip development. They can be used from birth and are available in various sizes and weights for different seasons. For example, a sleep sack made of light cotton may be suitable for summer, while a merino wool option could provide year-round comfort.
Swaddling, on the other hand, involves wrapping a baby snugly in a blanket to mimic the feeling of being in the womb. It is generally recommended for young infants and can be helpful for babies who have trouble settling. Swaddling can be done with a lightweight muslin blanket in warmer months and a cozier option in winter. However, it is important to note that swaddling can restrict arm and leg movement and should be discontinued once a baby starts to roll over, which is usually around 2 to 4 months old.
When deciding between a sleep sack and swaddling, consider the season, your baby's age, and their sleep preferences. Both options can help your baby stay warm and comfortable while sleeping, but it is crucial to prioritize safety by ensuring that your baby does not overheat and that their arms and legs have adequate room to move.
In terms of specific products, the Woolino brand offers a range of sleep sacks for different ages, from newborns to toddlers, made from breathable materials like merino wool and cotton. Halo Sleep also provides swaddle sleep sacks that create a cozy cocoon-like environment for babies. Additionally, Swaddelini offers patented Hug Technology® in their swaddles and sleep sacks, promoting a safe and nurturing sleep environment.
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Hats and overheating
Hats are not recommended for babies while they sleep. Babies regulate their body temperature by releasing heat through their head, so a hat can lead to overheating. Overheating is dangerous for babies and has been linked to an increased risk of Sudden Infant Death Syndrome (SIDS). Other risks associated with hats include the possibility of the hat falling off and covering the baby's face, which increases the risk of suffocation.
It is important to ensure that your baby does not get too hot or too cold while sleeping. The ideal room temperature for a baby is between 68° and 72°F. If your baby feels too warm, remove any extra layers of clothing and opt for lightweight, breathable sleepwear. On the other hand, if your baby feels too cold, you can add an extra layer, such as a receiving blanket if swaddling, or a wearable sleep sack.
It is generally recommended to dress your baby for sleep in a similar way to how you dress yourself. For example, if you are wearing a t-shirt and a sheet, your baby might wear a onesie and a lightweight swaddle or sleep sack. If you are wearing flannel pyjamas under a heavy comforter, your baby might need fleece-footed pyjamas and a sleep sack or swaddle. However, it is important to remember that babies may need one additional layer than adults, as they lose body heat more quickly.
It is crucial to monitor your baby's temperature and adjust their clothing or the room temperature accordingly. You can assess your baby's temperature by feeling their core, including their chest, neck, back, and tummy. If their core feels warm but not sweaty, they are likely comfortable. If you notice any signs of overheating, such as excessive sweating, redness or flushing of the skin, or tiredness, take immediate action to cool them down and seek medical advice if necessary.
In addition to room temperature and clothing, there are other factors to consider when creating a safe sleep environment for your baby. It is recommended that babies sleep in their own crib or bassinet in the same room as their caregiver for the first 6 to 12 months of life. This arrangement has been linked to a reduced risk of SIDS. It is important to avoid loose items in the crib, such as blankets, pillows, and stuffed animals, as they can pose a risk of suffocation or strangulation. Instead, opt for fitted clothing and sleep sacks that are snug-fitting and breathable.
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Safe sleeping positions
When it comes to safe sleeping positions for your 4-month-old, there are several guidelines to follow:
- Always place your baby on their back to sleep, not on their stomach or side. Sleeping on the back is recommended by the American Academy of Pediatrics (AAP) and has been linked to a decrease in the rate of SIDS.
- Ensure your baby sleeps on a firm, flat surface. The crib or bassinet should be covered with a sheet that fits snugly, and there should be no other objects in the sleep area, including pillows, blankets, toys, and bumpers.
- Avoid using infant sleep positioners, wedges, or monitors that claim to reduce the risk of SIDS. These devices can actually increase the risk of suffocation and may prevent your baby from moving out of an unsafe position.
- Room-sharing without bed-sharing is recommended by the AAP for the first 6 to 12 months or at least until the baby's first birthday. Having your baby sleep in the same room as you, in their own crib or bassinet, can reduce the risk of SIDS by up to 50%.
- Dress your baby appropriately for the room temperature to prevent overheating. As a general rule, your baby should wear one additional layer than you would wear at night. For example, a fitted onesie with sleep pants or a two-piece cotton PJ set with a muslin swaddle. Avoid loose clothing and accessories, such as hats, as they can pose a risk of suffocation.
- Keep the room well-ventilated and maintain a comfortable temperature between 68°F and 72°F. A fan can help circulate air and reduce the risk of SIDS.
- Avoid smoking in the house or around the baby, as this can also increase the risk of SIDS.
By following these guidelines, you can help create a safe and comfortable sleep environment for your 4-month-old. Remember to always consult with your pediatrician if you have any concerns or questions about your baby's sleep habits and safety.
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Frequently asked questions
In the summer, a 4-month-old can wear a onesie or baby pajamas made of breathable materials such as muslin. If it's very warm, a diaper with a lightweight swaddle may be enough. You can also use a sleep sack or sleep suit to keep your baby covered through the night.
You should avoid loose clothing and accessories such as hats, mittens, hair bows, and pacifier clips. Also, avoid anything that could be a choking hazard, such as clothing with buttons or zipper pulls.
The ideal room temperature for a baby to sleep in is between 68° and 72°Fahrenheit.








































