
Figuring out what a newborn should wear under a sleep sack can be a stressful experience for new parents. The ideal clothing for a newborn under a sleep sack depends on the season, the weather, and the temperature of the home and the room. The best room temperature for a baby is between 68 and 72 degrees F, and you should always aim to have their bedroom within this range. You can put any clothes that are well-fitted and comfortable under a sleep sack. A onesie or bodysuit may be easier until your child has more motor control.
| Characteristics | Values |
|---|---|
| Number of layers | There is no recommended number of layers. The number of layers depends on the season, weather, and temperature of the room. |
| Type of clothing | Well-fitted and comfortable clothing such as onesies, bodysuits, or pajamas. |
| Material | Breathable materials such as merino wool, which helps regulate body temperature and prevents overheating. |
| Temperature | Aim for a room temperature between 62 to 72°F (16 to 22°C). Dress the baby according to the temperature, with more layers in colder weather and fewer layers in hotter weather. |
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What You'll Learn

Dressing newborns for bed can be stressful
Sleep sacks are a great solution for parents, as they eliminate the need for blankets, which can be dangerous if the baby accidentally gets tangled up in them. However, figuring out what to wear under the sleep sack can be challenging. The key is to adjust the baby's clothing to the weather, season, and temperature of the room.
For example, in warmer months, a short-sleeve and legless bodysuit or romper can keep the baby comfortable, while in winter, a long-sleeved/long-legged romper or onesie may be more suitable. It's also important to ensure that the clothing is well-fitted and comfortable. Pajamas can be a good option, but for newborns, they can be a bit fiddly, so a onesie or bodysuit may be easier.
Additionally, it's crucial to pay attention to the TOG rating of the sleep sack, which indicates its warmth. The higher the TOG, the warmer it is. So, if you have a higher TOG sleep sack, you may want to dress your baby more lightly underneath, and vice versa.
Remember, every baby is unique, and they feel hot and cold differently. So, observe your baby's comfort and adjust accordingly. It may take some trial and error, but with time, you'll find the perfect balance for your little one's restful sleep.
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The ideal room temperature for a baby is 68-72°F
Keeping your newborn comfortable and safe is a priority, and room temperature plays a vital role in this. The ideal room temperature for a baby is 68–72 °Fahrenheit (20–22 °Celsius). This range creates a stable environment for your baby, ensuring they are neither too hot nor too cold.
Babies are more sensitive to changes in room temperature as their small bodies are still growing and developing temperature regulation. Overheating is a serious concern, as it is linked to Sudden Infant Death Syndrome (SIDS). Therefore, it is crucial to maintain a safe temperature range and appropriately dress your baby for the weather.
When deciding what to dress your newborn in under their sleep sack, consider the season, the weather, and the temperature of their room. You can adjust their clothing to help them stay cool in hot weather and keep them snug in cold weather. For example, in cooler weather, you can dress your baby in breathable layered clothing under their sleep sack, adding or removing layers as needed. Onesies or bodysuits made from breathable fabric like merino wool are excellent choices, as they help regulate body temperature by wicking away moisture and providing warmth without the risk of overheating.
Remember, it is unnecessary to obsess over the thermostat. As long as you are comfortable with the temperature, your baby will likely be, too. You can also use a room thermometer to monitor the temperature, aiming to keep the room within the ideal range. Additionally, ensure your baby's head remains uncovered during sleep, as they regulate their temperature through their head and face.
By following these guidelines, you can ensure your newborn remains comfortable and safe within the ideal room temperature range of 68–72 °Fahrenheit.
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Newborns can wear onesies, bodysuits, or footed pyjamas under sleep sacks
When it comes to putting your newborn to bed, you want to ensure they are comfortable and safe. Sleep sacks are a great solution, as they eliminate the need for blankets, which can be dangerous for babies. But what should your newborn wear under a sleep sack?
Well, it depends on the season, the weather, and the temperature of your home and their room. You want your newborn to be warm, but not too warm, cool but not too cool. The ideal room temperature for a baby is between 62 and 72 degrees F, and you should always aim for this range. In warmer temperatures, a nappy/diaper and short-sleeved vest or onesie may be enough, while in cooler temperatures, you can add a long-sleeved vest or onesie, and even footed pyjamas.
Onesies, bodysuits, or vests are great options to wear under a sleep sack. They are well-fitted and comfortable, and can be worn with or without additional layers, depending on the temperature. Footed pyjamas are also a good choice, especially in cooler weather, as they provide extra warmth. You can also add a hat and mittens in colder temperatures, but remember that children regulate their body temperature through their face and head, so never put your newborn to sleep with a hat.
Breathable materials such as merino wool are ideal for maintaining your newborn's body temperature. Merino wool helps to wick moisture away from the skin, keeping your baby dry and warm. It also allows for good air exchange, preventing overheating while providing warmth.
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The baby's clothing should depend on the season and temperature
The clothing your baby wears under a sleep sack should depend on the season and temperature. You want your baby to be warm, but not too warm, cool but not too cool. The ideal room temperature for a baby is between 62 and 72 degrees Fahrenheit. If the room is too hot or too cold, your baby's sleep may be disrupted.
In warmer months, you can dress your baby in a short-sleeve and legless bodysuit or romper. If the temperature is cooler, you can add a layer or two underneath the sleep sack, such as a onesie or footed pajamas. In the winter, a long-sleeved/long-legged romper or bodysuit made of breathable fabric will help keep your baby warm. Merino wool is a good option, as it helps to wick moisture away from the baby’s skin, leaving it dry and warm. It also allows for plenty of air exchange with the outside world, helping to prevent overheating while providing a pocket of warmth.
The weight of the sleep sack is also an important consideration. Sleep sacks with a higher TOG rating are warmer, while those with a lower TOG rating are lighter. For example, a 3.5 TOG sleep sack is designed for temperatures between 14° and 16°C, while a 2.5 TOG sleep sack is suitable for temperatures between 16° and 20°C.
It's important to remember that every baby feels hot and cold differently, and temperatures can fluctuate throughout the day and night. So, it's essential to observe your baby's comfort and adjust their clothing and the number of layers accordingly.
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Blankets are unsafe for newborns, but sleep sacks are a safe alternative
Blankets in a newborn's crib can be dangerous as they pose a risk of accidental suffocation. Instead, sleep sacks are a safe alternative that keeps babies warm and comfortable without the risk of suffocation. Sleep sacks eliminate the need for blankets, ensuring that newborns sleep comfortably and safely.
The ideal room temperature for a baby is between 62 to 68 degrees Fahrenheit. It is important to dress your newborn according to the weather, season, and temperature in their room. In warmer months, a short-sleeve and legless bodysuit or romper can keep them comfortable, while a long-sleeved/long-legged romper can be used during winter.
When using a sleep sack, you can dress your newborn in well-fitted and comfortable clothing such as onesies, bodysuits, or footed pajamas. It is recommended to avoid loose layers and instead opt for clothing that allows for easy movement and maintains a comfortable body temperature. Merino wool, for example, is a breathable fabric that helps wick moisture away from the baby's skin, keeping them dry and warm.
Additionally, it is crucial to consider the TOG rating of the sleep sack, which indicates its warmth. A higher TOG rating means the sleep sack is warmer, while a lower TOG rating indicates a lighter sack. By choosing clothing according to the TOG rating and the room temperature, you can ensure your newborn stays comfortable and safe throughout the night.
In summary, blankets are unsafe for newborns due to the risk of suffocation, but sleep sacks provide a safe and comfortable alternative. By dressing your newborn appropriately underneath the sleep sack and maintaining a suitable room temperature, you can ensure your baby's comfort and peace of mind for yourself as a parent.
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Frequently asked questions
The clothes you put under a sleep sack for a newborn should be well-fitted and comfortable. You can put them in a onesie, bodysuit, or footed pajamas. In warmer weather, a short-sleeve tee and a diaper cover may be enough. In cooler weather, you can add a light long-sleeve shirt.
You'll want to have plenty of sleep sacks so you always have enough, but your baby should only wear one at a time.
The best room temperature for a baby is between 62 to 72 degrees F. You can use a room thermometer to keep tabs on the temperature. Dress your baby according to the weather, season, and temperature in their room.
Never put your baby to sleep with a hat, beanie, or bonnet as children regulate their body temperature through their face and head. Also, avoid loose layers, pillows, blankets, or toys in their sleep space.
Sleep sacks are a safe alternative to blankets, which can be dangerous for newborns as they can accidentally suffocate. Sleep sacks also eliminate the need to cover your baby with a blanket, as they keep your baby warm and comfortable throughout the night.











































