
Knowing what to dress your baby in for sleep can be a stressful topic for parents. It's important to ensure your baby is dressed in clothing that suits the temperature of their bedroom to avoid overheating, which has been linked to sudden infant death syndrome (SIDS). The ideal room temperature for a baby to sleep comfortably is between 68–72 °F (20–22.2 °C). You can adjust your baby's clothing to suit this temperature, for example, a cotton bodysuit or long cotton pyjamas and a sleep sack on warmer nights. On colder nights, you might want to add a onesie underneath their pyjamas or use a heavier sleep sack.
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What You'll Learn
- Dressing your baby for the season: consider the temperature and dress your baby like you
- Using sleep sacks: a safer alternative to loose blankets, which can be a suffocation hazard
- Swaddling: a swaddle is like a cocoon, but stop swaddling when your baby can roll over
- Dressing for room temperature: a room temperature of 68–72 °F is recommended for sleeping
- Signs of overheating: a sweaty neck or hair, flushed cheeks, and a clammy core

Dressing your baby for the season: consider the temperature and dress your baby like you
When deciding how to dress your baby for sleep, it's important to consider the season and the temperature of their sleeping environment. The ideal room temperature for a baby to sleep comfortably is between 68°F and 72°F (20°C and 22°C).
As a general rule, you should dress your baby for sleep in a similar way to how you dress yourself for sleep. If you're wearing flannel pyjamas under a heavy comforter, dress your baby in fleece-footed pyjamas and a sleep sack or swaddle. If you're wearing a t-shirt and a sheet, your baby might wear a onesie and a lightweight swaddle or sleep sack.
It's important to focus on your baby's core temperature, rather than the temperature of their hands or feet, which are often cooler due to less blood flow. Feel their tummy, neck, chest, and back to check if they're warm but not sweaty, or cold. This will help you assess whether they're dressed appropriately for the temperature.
In the colder months, you may need to dress your baby in more layers than you would usually wear yourself. For example, you might put them in long-sleeved pyjamas, a sleep sack, and mittens and socks if the room temperature is below 60°F. On warmer nights, opt for lightweight, breathable sleep clothes for your baby, such as a cotton bodysuit or lightweight sleep sack.
It's important to avoid overdressing your baby, as this can lead to overheating, which is a risk factor for sudden infant death syndrome (SIDS). Blankets, pillows, and other loose items should not be placed in a baby's crib, as they can also increase the risk of SIDS. Instead, use sleep sacks or wearable blankets to keep your baby warm, ensuring that their head remains uncovered.
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Using sleep sacks: a safer alternative to loose blankets, which can be a suffocation hazard
Sleep sacks, also known as wearable blankets, are a safer alternative to loose blankets for your 4-month-old. They are designed to be worn over pyjamas and provide a secure layer to help maintain your baby's body temperature while they sleep. Sleep sacks are sleeveless and usually zippered, reducing the risk of suffocation or entanglement. They are particularly useful if your baby has started rolling over, as they provide freedom of movement while keeping your baby snug and warm.
Sleep sacks are a good option if you want to avoid the hazards of loose bedding. Unlike blankets, sleep sacks stay securely on your baby, reducing the risk of suffocation. They are also safer than swaddling once your baby can roll over, as a swaddled baby may struggle to turn onto their back if they end up face down. However, it's important to note that sleep sacks should not restrict your baby's movement, and if they start trying to roll over in a sleep sack, you should consider transitioning them to a different sleeping arrangement.
When choosing a sleep sack, you can select different TOG ratings depending on the season. A lightweight sleep sack is suitable for summer, while a thicker one will keep your baby warm in winter. You can also choose between different sizes to ensure your baby has enough room to move freely while still feeling secure.
To ensure your baby is dressed appropriately for sleep, it's important to consider the temperature of their bedroom. In addition to a sleep sack, you may want to dress your baby in a onesie or long-sleeved pyjamas. If the room is particularly cold, you can add layers such as mittens and socks. However, remember that babies should not be dressed in more than one additional layer than adults in the same environment.
When dressing your 4-month-old for sleep, it's crucial to prioritise safety and comfort. Sleep sacks can be a safer alternative to loose blankets, providing warmth and security without the risk of suffocation. By choosing the right size and TOG rating, you can ensure your baby stays cosy and gets a good night's sleep.
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Swaddling: a swaddle is like a cocoon, but stop swaddling when your baby can roll over
Swaddling is an ancient practice of wrapping up a baby to help them sleep. It recreates the feeling of being in the womb, providing security and warmth. To swaddle your baby, spread a square blanket out and fold one corner down. Then, place your baby lying face-up with their head at the edge of the folded corner. Next, bring the left corner of the blanket across your baby's body and tuck it between their right arm and body, going under their lower back and bottom. Finally, gently straighten your baby's left arm so it's against their side.
Swaddling can calm babies and help them sleep, but it's important to know when to stop. You should stop swaddling when your baby starts to roll over to avoid safety hazards. This typically happens between 2 and 6 months old, but some babies may start rolling as early as 2 months or 8 weeks. If your baby is able to get their body up onto their shoulder, this is a sign of rolling, and it's time to stop swaddling.
It's crucial to monitor your baby's development and adjust their sleeping arrangements accordingly. Once your baby starts rolling, they need their arms to be free to push themselves up if they roll onto their tummy. Continuing to swaddle after this stage can impact their motor skill development and increase the risk of sudden infant death syndrome (SIDS).
To transition out of swaddling, you can use a sleep sack or wearable blanket that doesn't restrict your baby's arms and chest. These can be worn up to about 2 years old or 30 lbs. After your baby outgrows a sleep sack, they can start using a regular blanket.
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Dressing for room temperature: a room temperature of 68–72 °F is recommended for sleeping
A room temperature of 68–72 °F is recommended for a baby's sleep. This temperature range is considered ideal for babies and toddlers alike. It is important to ensure that your baby is dressed warmly without overheating. Overheating has been linked to an increased risk of Sudden Infant Death Syndrome (SIDS).
When determining how to dress your baby for sleep, it is recommended to dress them in one extra layer than you would wear to feel comfortable. For example, if you are wearing a t-shirt and a sheet to bed, your baby might need to wear a long-sleeved onesie, long-sleeved pyjamas, or a wearable blanket or sleep sack. If you are wearing flannel pyjamas under a heavy comforter, your baby might need to wear fleece-footed pyjamas and a sleep sack or swaddle.
It is important to assess your baby's temperature and adjust their clothing accordingly. You can feel their back, neck, chest, tummy, or core to determine if they are too warm or cold. If their skin feels damp or their chest feels warm, remove a layer or lower the temperature in the room.
Sleep sacks or wearable blankets are a good option for keeping your baby warm while allowing them to move their arms and legs freely. When choosing a sleep sack, consider the TOG (Thermal Overall Grade) rating, which indicates the thickness and warmth level of the fabric. For room temperatures of 68–72 °F, a sleep sack with a TOG rating of 1.0 is recommended.
Additionally, choose breathable and lightweight fabrics such as cotton, linen, silk, hemp, cashmere, or wool for your baby's sleepwear. These fabrics are also suitable for layering and provide insulation.
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Signs of overheating: a sweaty neck or hair, flushed cheeks, and a clammy core
Keeping your baby comfortable while they sleep is important, and overheating can cause discomfort and restlessness. It can also increase the risk of SIDS (Sudden Infant Death Syndrome). Babies are not great at regulating their body temperature, so it's important to keep an eye on them and ensure they are dressed appropriately for the temperature of their room.
A good rule of thumb is to dress your baby the way you would dress yourself for sleep. If you're wearing a t-shirt and a sheet, your baby might wear a onesie and a lightweight swaddle or sleep sack. If you're wearing flannel pyjamas under a heavy comforter, your baby might need fleece-footed pyjamas and a sleep sack.
However, it's important to remember that babies are at higher risk of overheating, especially in the winter when parents tend to overdress them or turn up the heat. So, while you can use your own clothing as a guide, it's also important to monitor your baby for signs of overheating.
Signs of Overheating
A sweaty neck or hair, flushed cheeks, and a clammy core are all signs that your baby may be too warm. You can feel your baby's core by touching their chest, neck, back, and tummy. If these areas feel sweaty or clammy, it's a sign that your baby is too hot. You may also notice that their ears are red and hot, and they may appear restless or lethargic.
If you notice any of these signs, remove any excess layers of clothing and replace them with loose-fitting, dry garments. You can also move your baby to a cooler room, give them a lukewarm bath, or place a cool washcloth on their skin to help them cool down.
It's important to maintain a comfortable room temperature for your baby, ideally between 68 and 72°F (20 and 22°C). You can use a baby monitor that measures room temperature to ensure the room is within this range.
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Frequently asked questions
The ideal room temperature for a sleeping baby is between 68°F and 72°F (20°C and 22°C). If the room is within this range, your baby should wear a diaper, comfy long-sleeved pyjamas, and a lightweight wearable blanket or sleep sack. You can also use a cotton bodysuit or a cotton or muslin swaddle.
If the room temperature is under 60°F, your baby should wear mittens, socks, a long-sleeved onesie, long-sleeved pyjamas, and a sleep sack or swaddle. You can also use warmer pyjamas made of fleece or similar materials.
Focus on your baby's core temperature, not their hands or feet, which are often cooler due to less blood flow. Feel their tummy, neck, or chest for a more accurate check. If their core feels warm but not sweaty, and not cold, then they're likely comfortable. Signs that your baby is too hot include a sweaty neck or hair, flushed cheeks, and a clammy or sweaty core.









































