
As a new parent, it can be challenging to know what to dress your baby in, especially for sleep. The ideal sleep temperature for a baby is between 68 and 72 degrees Fahrenheit (16-20°C). At this temperature, your baby should wear a vest, sleepsuit, and a lightweight sleeping bag. If it's below 20°C, you should layer up your newborn with a sleepsuit and a vest. Newborns tend to run warmer than adults, so it's important to ensure they don't overheat. On very cold nights, you might want to add an additional sweater.
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What You'll Learn

How to check your newborn's temperature
As a new parent, it can be confusing to know how to dress your baby for sleep in winter. The ideal sleep temperature for a baby is between 68 and 72 degrees Fahrenheit or 16 to 20 degrees Celsius. At this temperature, your baby should wear a vest and a sleepsuit, and be placed in a lightweight sleeping bag.
If the temperature is below 20 degrees Celsius, you should add more layers, such as a footed onesie under the sleep sack. On very cold nights, you might want to add an additional sweater.
It's important not to overdress your baby for sleep, as this can be dangerous. If your baby feels clammy or sweaty, they are probably too warm and need to be dressed in lighter clothing.
- The most accurate way to check a newborn's temperature is to take a rectal temperature reading. This method gives a quick and accurate reading of the baby's internal temperature. Use a digital rectal thermometer with a short probe to reduce the chance of injury.
- You can also use a forehead thermometer to check your newborn's temperature. This measures the core body temperature through the artery on the forehead and is just as accurate as a rectal thermometer but with less discomfort.
- Another way to check your baby's temperature is to use an armpit thermometer. Any digital thermometer can be used for this. Make sure there is nothing between the thermometer and your baby's skin.
- You can also test your baby's temperature using a skin test. Feel their hands, nose, back of the neck, and hairline. Most babies will have cool hands in cold weather, but if they feel sweaty or clammy, they may be too warm.
Remember, it's important to keep your baby's head covered during the day in cold weather, and to protect them from direct sunlight.
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How to layer for winter sleep
Layering your baby for winter sleep is an art that you will quickly get the hang of. The key is to keep them warm without overheating them. The ideal sleep temperature for a baby is between 68 and 72 degrees Fahrenheit (16-20°C). If the room is this temperature, your baby should wear a vest, sleepsuit, and a lightweight sleeping bag.
Swaddling
Swaddling is a great way to keep your baby warm and safe. It is especially good for younger babies who still have a startle reflex. It is also a good way to add an extra layer of warmth for your sleeping baby. However, once your baby starts to roll over, it is time to stop swaddling them.
What to wear under a swaddle
If you are using a swaddle, you should dress your baby in a short-sleeved onesie or a long-sleeved footed onesie. If the temperature is very cold, you can add a sweater or a pair of long-sleeved footie pajamas.
Sleeping bags
If your baby is older, you can use a sleeping bag instead of a swaddle. The ideal winter sleeping bag should have at least a 1.5 TOG rating. You can also add a vest or a sleepsuit underneath the sleeping bag.
Accessories
Don't forget accessories such as booties, beanies, and mittens to help your baby trap heat against their body. However, do not put a hat on your baby when they sleep as it could slip over their face and cover their mouth.
General tips
- The general rule of thumb is that babies should wear one more layer than an adult would.
- Babies tend to run warmer than adults as they have a higher metabolism.
- It is normal for babies to have cool hands in colder weather.
- If your baby feels clammy or wakes up sweating, they are probably too warm.
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The benefits of swaddling
Newborns have unique sleepwear requirements, especially during winter. While there are various ways to keep your baby warm, one time-tested method is swaddling. Swaddling is the traditional practice of gently wrapping a baby in a light, breathable blanket to help them feel calm and sleepy. Here are some benefits of swaddling:
Promotes Calmness and Sleep
Swaddling is known to promote calmness and sleep in infants. The gentle wrapping technique helps newborns feel snug and secure, reminiscent of the comfort they experienced in the womb. Research has shown that swaddling, combined with sound and movement, effectively soothes crying babies and reduces crying and stress.
Temperature Regulation
Swaddling can aid in temperature regulation, which is crucial for newborns who are still developing the ability to regulate their body temperature. It provides warmth without the risk of loose blankets covering the baby's head. The use of light, breathable fabrics ensures that the baby remains comfortable without overheating.
Safety
Swaddling offers a safer alternative to loose blankets, which can pose a suffocation risk for newborns. By securely wrapping the baby's body while leaving the neck and head uncovered, swaddling reduces the chances of accidental smothering.
Hip Development
While there are concerns about swaddling restricting hip movement and potentially causing hip dysplasia, certain swaddling techniques address this issue. By allowing the legs to bend up and out at the hips, hip-friendly swaddling methods support the natural development of the hip joints.
It is important to note that swaddling should only be introduced when your baby is a newborn and has not yet shown signs of rolling over. As soon as they start to roll or show signs of doing so, it is recommended to transition away from swaddling. Additionally, always place your baby on their back to sleep, whether swaddled or not, to further reduce the risk of sudden infant death syndrome (SIDS).
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Sleep sacks and sleep suits
Sleep sacks with full-length zippers are easy to put on and take off and are a great option for newborns. You can pair a sleep sack with a onesie or a footed onesie underneath for added warmth. For colder months, you can choose a sleep sack with a higher TOG rating, such as the Clever Sleep Sack with a 2.5 TOG rating. The Magic Merlin sleep sack is another option that allows your child to have their arms and legs free, although it may not offer much movement for self-soothing.
Sleep suits, also known as sleepwear or pajamas, are another option for newborns in the winter. These are usually made from soft, micro-fleece or cotton and can include built-in footies. Sleep suits with a chest-to-ankle zipper are a convenient option. You can also layer a sleep suit with a vest and a lightweight sleeping bag to keep your baby warm.
It is important to remember that newborns cannot regulate their body temperature, so it is essential to ensure they are dressed appropriately for the weather and their room temperature. The ideal sleep temperature for a baby is between 68 and 72 degrees Fahrenheit or 16 to 20 degrees Celsius. You can use a baby room thermometer to determine the temperature of your baby's room and adjust their clothing accordingly.
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What materials to use
When it comes to materials for newborn sleepwear, there are a few key considerations to keep in mind. Firstly, it's important to choose soft, comfortable fabrics that will keep your baby warm without causing them to overheat. Here are some specific materials to consider:
Cotton: Cotton is a lightweight, breathable fabric that is ideal for newborn sleepwear. It offers ample flexibility, making it perfect for swaddling. Organic cotton is a popular choice for its softness and sustainability.
Micro-fleece: Micro-fleece is a good option for colder months as it provides extra warmth. It is soft and comfortable, and often comes with built-in footies to keep your newborn's feet warm.
Muslin: Muslin is another lightweight and breathable fabric option. It is flexible and ideal for swaddling, especially in warmer climates.
Bamboo: Bamboo fabric is known for its softness and breathability. It is also thermoregulating, which means it can help keep your baby at a comfortable temperature.
Wool: Wool is a natural fabric that provides excellent insulation for cold winter nights. Wool sleep sacks can be a cosy option to keep your newborn warm.
It's important to remember that the number of layers and type of fabric you choose may vary depending on the temperature and your newborn's needs. Some newborns tend to run warmer, so it's essential to monitor their temperature and adjust their sleepwear accordingly. Additionally, accessories like booties, beanies, and mittens can help trap heat and keep your newborn snug during winter.
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Frequently asked questions
The ideal sleep temperature for a baby is between 68 and 72 degrees Fahrenheit. If the room temperature is between 16 and 20 degrees, dress your baby in a vest, sleepsuit and a lightweight sleeping bag. For colder weather, you can dress your baby in three layers with different tog sleeping bags. For instance, a short-sleeve onesie plus long-sleeve footie pyjamas.
The general rule of thumb is that babies should wear one more layer than adults. For instance, if you are going outside in a t-shirt, pants and a puffer jacket, dress your baby in a singlet under their growsuit, with a coat or cardigan on top, along with mittens, booties and a beanie.
Avoid loose blankets as they can pose a suffocation risk. Instead, opt for a thick swaddle or a wearable sleep blanket (sleep sack). Also, remember not to overdress your baby as it can lead to overheating.











































