
Deciding what to dress your newborn in for sleep can be a confusing and stressful task for new parents. It can be difficult to tell if your baby is too cold, too warm, or just right. It is important to keep your baby's crib free of blankets, pillows, and stuffed animals, as these can pose a suffocation risk. Instead, it is recommended to dress your baby in a single layer of clothing, such as a onesie, to prevent them from becoming too cold or overheating. In warmer months, a short-sleeve onesie may be a good option, while in cooler months, a long-sleeve onesie with or without socks may be more appropriate.
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What You'll Learn

Safe fabrics for onesies
When choosing a onesie for a newborn, it is important to select a safe and comfortable fabric. Newborns have very delicate skin, and not all fabrics are suitable for them. Here are some safe fabric options to consider for your baby's onesie:
Cotton
Cotton is a popular choice for baby clothes, including onesies. It is soft, breathable, durable, and highly absorbent. These qualities make it ideal for sensitive skin. Cotton is also gentle and easy to care for, as it can be machine washed and dried. Organic cotton is an even better option, as it is grown and processed without the use of harmful chemicals or pesticides, making it safer and more eco-friendly. It is also softer and more comfortable for a baby's skin. However, keep in mind that organic cotton may fade faster due to the absence of chemical treatments.
Bamboo
Bamboo fabric is a natural, eco-friendly option that is becoming increasingly popular for baby clothes. It is extremely soft, hypoallergenic, and has thermo-regulation abilities, making it suitable for both warmer and colder weather. Bamboo fabric is also highly absorbent, ensuring your baby stays dry. However, bamboo clothing can be expensive and requires special care to retain its shape and softness.
Wool
Wool is known for its excellent insulating and temperature regulation properties. It can keep babies warm in cold conditions while ensuring they don't overheat. Wool is a highly breathable and moisture-wicking natural fiber, making it suitable for both warm and cold climates. However, care must be taken to choose high-quality, fine wool to avoid potential skin irritation.
Fleece
Fleece is commonly used for baby onesies, especially during the colder months. It is soft, lightweight, and easy to care for. It has heat-retaining properties, making it perfect for keeping your baby warm. However, fleece may not be suitable for warmer climates.
Jersey Knit
Jersey knit fabric, such as cotton jersey, is incredibly soft, breathable, and stretchy. It is comfortable for babies and allows for easy movement during their growth spurts. Jersey knit is also lightweight and suitable for warmer climates.
When choosing a fabric for your newborn's onesie, it is important to prioritize safety and comfort. Avoid harsh and scratchy fabrics that can cause discomfort and irritation. Durability and ease of maintenance are also important considerations. By choosing the right fabric, you can ensure your baby stays warm, safe, and comfortable.
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Onesies and room temperature
When it comes to putting your newborn down for sleep, it's essential to prioritise their safety and comfort. Here are some informative guidelines about onesies and room temperature for your newborn:
Onesies
Onesies are a popular choice for newborn sleepwear, offering comfort and practicality. They are available in various styles, including long-sleeve and short-sleeve options, allowing you to choose based on the room temperature. In warmer months, a short-sleeve onesie can be a great choice, while a long-sleeve onesie with or without socks may be more suitable for cooler weather. You can also pair a onesie with sleep pants or swaddle to provide extra warmth. It's important to ensure that the onesie fits snugly to prevent it from riding up over your baby's face.
Room Temperature
Maintaining the right room temperature is crucial for your newborn's comfort and safety. The ideal temperature range for your baby's room is between 60°F and 72°F (16-22°C). In colder months, you may need to adjust the thermostat or use a space heater to achieve this temperature range. If you can't control the room temperature, it's important to dress your baby appropriately, adding layers when needed. Keep in mind that babies sleep better in cooler environments, and overheating can increase the risk of SIDS.
Combining Onesies and Room Temperature
When combining onesies and room temperature considerations, it's important to strike a balance. In rooms with temperatures between 62°F and 75°F, a onesie can be a suitable choice. You can adjust the warmth by pairing the onesie with socks, sleep pants, or a sleep sack. For example, in the lower range of this temperature, a long-sleeve onesie with socks may be ideal. As the temperature rises, you can remove the socks or opt for a short-sleeve onesie. Always monitor your baby's comfort level and adjust their clothing or the room temperature accordingly.
Additional Considerations
It's important to prioritise your newborn's safety when they sleep. Avoid loose blankets, pillows, toys, and other items in the crib, as they can pose a suffocation hazard. Instead, opt for sleep sacks or swaddles, ensuring they are securely fastened. Additionally, avoid hats, hoods, or any head coverings, as they can increase the risk of overheating and suffocation. Always place your baby on their back to sleep, and ensure their clothing fits snugly to prevent it from riding up and covering their face.
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Onesies and swaddling
Swaddling is the practice of snugly wrapping a light blanket around a newborn baby. It is important to ensure that the swaddle is wrapped more firmly around the chest and more loosely around the hips and knees. You can leave the arms out or include them based on your baby's needs. Commercial swaddles often have Velcro or other fasteners, which should be securely attached. Swaddling can help soothe your newborn by replicating the womb environment, but it is important to stop swaddling your baby once they start trying to roll over, as it can become dangerous.
When dressing your newborn for sleep, it is crucial to prioritize safety. Avoid loose blankets, pillows, hats, hoods, or any type of head covering, as these can pose a suffocation or strangulation risk. The ideal room temperature for a sleeping baby is between 60-70°F (16-20°C), and you can adjust your baby's clothing accordingly. It is recommended to dress your baby in one additional layer beyond what an adult would wear, such as a onesie or sleep sack.
Sleep sacks, or wearable blankets, are another popular option for newborn sleepwear. They provide a safe alternative to blankets and help keep your baby warm without the risk of suffocation. Sleep sacks come in different fabrics, such as cotton for warmer temperatures and fleece for colder months. You can combine a long-sleeved onesie with a sleep sack for added warmth.
In summary, onesies and swaddling are both safe and comfortable options for newborn sleepwear when paired with the appropriate number of layers to maintain a comfortable temperature. It is important to prioritize breathable fabrics, a safe sleeping environment, and the transition from swaddling to a wearable blanket once your baby starts rolling over.
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Onesies and sleep sacks
When it comes to putting your newborn to sleep, it is important to ensure that they are dressed appropriately to prevent them from overheating or getting too cold. The ideal room temperature for a sleeping baby is between 60-70 °F (16-20 °C) or 68-72 °F (20-22 °C). In warmer room temperatures, you can dress your baby in a onesie made from breathable materials such as cotton or muslin. On very warm nights, your baby may also be comfortable in just a diaper with a lightweight swaddle. Short-sleeve onesies are usually a great choice in warmer months.
Onesies are a great option for newborn sleepwear as they provide a single layer of clothing, which helps to regulate your baby's temperature. They can be paired with sleep sacks, which are a safer alternative to blankets and other unsafe sleep items. Sleep sacks are designed to reduce the chances of your baby getting trapped or smothered. They come in various fabrics, allowing you to customize the warmth for your baby. For example, cotton is best for warmer temperatures, while fleece is suitable for winter.
In cooler temperatures, you can opt for a long-sleeve onesie with or without socks. If it's very cold, you might want to add a sleep sack or extra layers such as receiving blankets. However, it is important not to overdress your baby, as this can lead to overheating, which increases the risk of SIDS. Avoid using loose blankets, hats, or any type of head covering, as these can pose a suffocation hazard and interfere with temperature regulation.
As your baby grows and becomes more mobile, you may need to adjust their sleepwear. Once your baby starts rolling over, it's time to transition from swaddling to a lightweight sleep sack or wearable blanket. This typically happens around the 3- or 4-month mark, but it can be sooner. At this stage, it's important to ensure their arms are free to allow them to push themselves up if needed.
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Onesies and other clothing
- Fabric choices: Opt for breathable and lightweight fabrics like cotton, especially in warmer months. In cooler temperatures, you can choose a onesie made from fleece or terrycloth. Ensure the fabric is comfortable and gentle on your baby's skin.
- Sleeves and layers: Onesies come in long-sleeve and short-sleeve options. For cooler temperatures, a long-sleeve onesie with or without socks can be a great choice. In warmer months, a short-sleeve onesie will keep your baby comfortable. You can also layer a onesie under sleep sacks, pajamas, or a swaddle for added warmth.
- Safety considerations: Ensure that the onesie fits snugly and doesn't have loose ends that could cover your baby's face. Avoid onesies with small attachments like buttons or zippers, as these can pose a choking hazard. Always dress your baby in a single layer of clothing to prevent overheating, and avoid hats or head coverings, as they can increase the risk of overheating and suffocation.
- Combination with other clothing: Onesies can be combined with sleep sacks, pajamas, or swaddles, depending on the temperature. Some parents prefer to dress their babies in a onesie and sleep pants or a long-sleeve onesie with socks. You can also use a lightweight swaddle or sleep sack over a onesie for added warmth.
- Temperature guidelines: Keep your baby's room temperature between 60°F and 72°F. Adjust the number of layers or the weight of the sleep sack based on the temperature. If your baby is too warm, they may be uncomfortable and at an increased risk of SIDS.
- Signs of discomfort: Watch for signs that your baby may be too warm or too cold. If your baby is sweating or hot to the touch, remove a layer. If they have blue-colored hands or feet, consider adding an extra layer.
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Frequently asked questions
Yes, a newborn can sleep in a onesie. In warmer months, a short-sleeve onesie is a good option, while a long-sleeve onesie is better for cooler environments. It is recommended that newborns are dressed in a single layer of clothing to prevent them from becoming too cold or overheating.
Newborns can also sleep in sleep sacks, pajamas, or a diaper with a lightweight swaddle. Sleep sacks are a safer alternative to blankets, which can increase the risk of suffocation and SIDS.
The ideal room temperature for a newborn is between 60-70 °F (16-20 °C). According to other sources, the ideal range is 68-72 °F (62-75 °F at the lower end).
If your baby is cold, their hands or feet may turn blue. If your baby is too warm, they may be sweating or feel hot to the touch.











































