
Deciding what to dress your baby in for sleep can be a stressful experience for new parents. The ideal clothing for a 12-month-old baby to sleep in is a one-piece bodysuit, also known as a baby onesie or romper. This can be layered with a sleep sack to prevent the need for loose blankets. It is recommended that the ideal room temperature for a baby's sleep environment should be between 68° and 72°F. To prevent the risk of overheating, babies should not sleep with loose sheets or blankets, and their sleepwear should be one additional layer compared to what an adult would wear in the same environment.
What do 12-month-olds wear to sleep?
| Characteristics | Values |
|---|---|
| Number of layers | One additional layer compared to adults in the same environment |
| Room temperature | 68°-72°F (20°-22°C) |
| Clothing options | Footed onesie, two-piece cotton pyjama set, footed pajamas, long-sleeved pajamas, romper, bodysuit, leggings, sleep sack |
| Accessories | No hats, beanies, bonnets, pillows, blankets, or toys in the sleep space |
| Considerations | Avoid overheating, assess baby's core temperature, re-evaluate clothing options as the baby grows |
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What You'll Learn
- Dressing for the seasons: In winter, a baby can wear fleece pyjamas or a heavier sleep sack. In summer, a lightweight swaddle or sleep sack should be used
- Room temperature: The ideal room temperature is between 68° and 72°F
- Layers: A baby should wear one additional layer than an adult would
- Sleep sacks: Sleep sacks are a safe alternative to blankets
- Hats: Hats are not recommended for sleep as they can cause overheating

Dressing for the seasons: In winter, a baby can wear fleece pyjamas or a heavier sleep sack. In summer, a lightweight swaddle or sleep sack should be used
When it comes to dressing your 12-month-old baby for sleep, it's important to consider the seasons and adjust their clothing accordingly. Here are some guidelines to follow:
Dressing for Winter
In colder months, you can dress your baby in fleece pyjamas, which will keep them warm and comfortable. Look for footed pyjamas or fleece-footed options to ensure their feet stay cosy. Alternatively, you can opt for a full-length romper or a combination of a romper and leggings. If you're using a standard cotton onesie or pyjama set, you can add a heavier sleep sack or microfleece swaddle over it to provide extra warmth. Just be sure to avoid any loose items, such as blankets or hats, as these can pose a safety risk.
Dressing for Summer
During the warmer months, it's important to dress your baby in lightweight and breathable clothing. A lightweight swaddle or sleep sack made with single sheets of cotton is ideal. You can dress your baby in a long-sleeved onesie, tops and bottoms, or zip-up jammies under their sleep sack. Choose a sleep sack with a lower TOG rating to help your baby stay cool. Remember, it's better to have your baby slightly underdressed than heavily overdressed, as overheating can increase the risk of Sudden Infant Death Syndrome (SIDS).
General Considerations
When dressing your 12-month-old for sleep, it's important to maintain a comfortable room temperature. The ideal room temperature range is between 68°F and 72°F. However, you can adjust this based on your baby's sleeping environment and their comfort. Assess your baby's comfort by feeling their core temperature, including their chest, neck, back, and tummy. If their core feels warm but not sweaty, you've dressed them appropriately. Additionally, remember that your baby's sleepwear may need to change as they become more mobile and independent.
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Room temperature: The ideal room temperature is between 68° and 72°F
The ideal room temperature for a 12-month-old baby to sleep comfortably is between 68° and 72°F (20° to 22°C). At this temperature, your baby can sleep without the risk of overheating or getting too cold. It's important to ensure that your baby's sleeping environment is safe and comfortable. Here are some tips to achieve that:
Avoid loose items in the crib: Do not place loose items such as blankets, hats, hair accessories, toys, or any other objects in the crib with your baby. These items can pose a risk of suffocation or SIDS (Sudden Infant Death Syndrome). Instead of loose blankets, consider using a sleep sack rated for the appropriate room temperature to keep your baby warm. Sleep sacks are available in different TOG ratings, indicating their warmth level. Choose one suitable for your room temperature to ensure your baby doesn't overheat.
Dress your baby appropriately: As a general rule, dress your baby in one additional layer than you would wear yourself in similar conditions. For example, a two-piece cotton PJ set or a footed onesie with a muslin swaddle should be sufficient. However, adjust the layers according to your baby's sleeping environment. It's better to have your baby slightly underdressed than heavily overdressed, as overheating is linked to an increased risk of SIDS.
Consider the season and room temperature: Reassess your baby's sleep clothing as the seasons change. In the winter, you may need to dress your baby in warmer clothing or use a heavier sleep sack. On the other hand, in the summer, opt for lightweight clothing and a lighter sleep sack. If your home tends to be warmer or cooler than the recommended range of 68° to 72°F, adjust your baby's clothing accordingly.
Monitor your baby's comfort: Feel your baby's core, including their chest, neck, back, and tummy, to assess their temperature. If their core feels warm but not sweaty, and not cold, then they are likely comfortable. Observe your baby for signs of being too hot or too cold and adjust their clothing or the room temperature as needed.
Swaddling considerations: Swaddling can help your newborn feel secure and comfortable, but it's important to do it safely. Ensure there is a two- to three-finger gap between the swaddle and your baby's chest to allow for easy breathing. Stop swaddling once your baby starts rolling over, usually around the three-month mark, and transition to a sleep sack or wearable blanket to keep them warm.
By following these guidelines, you can ensure that your 12-month-old baby sleeps comfortably and safely in the ideal room temperature range of 68° to 72°F.
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Layers: A baby should wear one additional layer than an adult would
When putting a 12-month-old baby to sleep, it is recommended to dress them in one more layer than what an adult would wear to be comfortable. This is because babies should not sleep with loose blankets, which pose a risk of suffocation and increase the chances of Sudden Infant Death Syndrome (SIDS).
The ideal room temperature for a baby's sleep environment is between 68° and 72°F (20° to 22°C). If the room temperature is within this range, a two-piece cotton PJ set or a footed onesie plus a muslin swaddle should suffice. However, if the room is cooler, you can add a layer with a sleep sack or a swaddle. On warmer nights, a onesie and a lightweight swaddle or sleep sack should be enough.
It is important to assess your baby's temperature by feeling their core, including their chest, neck, back, and tummy. If their core feels warm but not sweaty, and their cheeks are not flushed, then they are likely comfortable. If your baby is dressed too warmly, you can reduce the layers under their sleep sack or opt for a sleep sack with a lower TOG rating.
As babies grow, their sleep needs and requirements may change. For example, once a baby becomes more mobile and starts pulling up or standing, you may need to adjust their sleepwear and bedding accordingly. Additionally, as they approach their first birthday, you may introduce a small, thin blanket for added warmth, but this should be done with careful consideration.
It is worth noting that babies regulate their body temperature through their heads, so it is not recommended to put hats on them while sleeping. Instead, ensure their sleeping environment is appropriately temperature-controlled, and dress them in one more layer than you would wear yourself to be comfortable.
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Sleep sacks: Sleep sacks are a safe alternative to blankets
When putting your baby to sleep, it's important to consider their comfort, the temperature, and their safety. A general rule of thumb is to put your baby in one additional layer than you would wear. However, it's important to avoid loose items, such as blankets, hats, and other clothing, as these can pose a safety risk. Sleep sacks are a safe alternative to blankets and can be used to keep your baby warm. They are also known as wearable blankets and are a good option for babies who are starting to roll, as they keep the hands free.
Sleep sacks are available in different weights, so you can choose one that's appropriate for the season. For example, a heavier microfleece sleep sack can be used in winter, while a lightweight sleep sack or swaddle may be more suitable for warmer months. You can assess whether your baby is comfortable by feeling their core (chest, neck, back, and tummy). If their core feels warm but not sweaty, and not cold, then they are likely comfortable.
It's important to note that as your baby grows, you may need to reevaluate their sleep setup. A sleep sack that worked for a 3-month-old baby may not be suitable for a 12-month-old. Additionally, once your baby becomes more active and starts pulling up or standing, you may need to transition away from sleep sacks. At this point, you may consider adding a small thin blanket, but it's important to make this decision thoughtfully and consult your pediatrician if you have any doubts.
The ideal room temperature for a baby's sleep is between 68° and 72°F (20° to 22°C). However, it's worth noting that babies can still be comfortable and safe outside of this range if they are dressed appropriately for the temperature. For example, in warmer climates, your baby may not need as many layers as recommended in the general guidelines.
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Hats: Hats are not recommended for sleep as they can cause overheating
When it comes to putting your 12-month-old baby to sleep, it is important to remember that hats are not recommended as they can cause overheating. This is a significant concern because overheating has been linked to an increased risk of Sudden Infant Death Syndrome (SIDS). While this risk is most pronounced in the first six months, it remains a concern for toddlers as well.
Babies regulate their body temperature through their head, so wearing a hat can disrupt this natural process and lead to overheating. It is crucial to maintain a safe sleeping environment by keeping the ideal room temperature between 68°F and 72°F. Adjustments can be made based on your baby's sleeping environment, adding or removing a layer as needed. It is better to have your baby slightly underdressed than heavily overdressed.
Hats, along with other loose items such as blankets, mittens, hair bows, and pacifier clips, are not considered safe for sleep. These items can pose a safety hazard, as a hat could slip off your baby's head and cover their face, inhibiting their ability to breathe freely. Therefore, it is recommended to avoid hats and opt for other safe clothing options to keep your baby warm during sleep.
Instead of a hat, you can consider using a sleep sack, which is a great alternative to blankets that your baby might kick off during the night. Sleep sacks are available in different TOG ratings, indicating their warmth level. For colder months, choose a sleep sack with a higher TOG, and for warmer months, opt for a lower TOG to help your baby stay cool. Additionally, you can layer clothing underneath the sleep sack, such as a long-sleeved onesie, tops, bottoms, or zip-up pajamas.
In summary, hats are not recommended for 12-month-olds during sleep due to the risk of overheating and potential breathing hazards. Instead, maintain a comfortable sleeping environment with appropriate room temperatures and consider using sleep sacks and appropriate layers of clothing to keep your baby warm and safe during their slumber.
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Frequently asked questions
A standard sleep sack with a TOG rating of 2.5 should be suitable for a 12-month-old baby in the summer. You can dress your baby in a long-sleeved onesie, tops and bottoms, or zip-up jammies under their sleep sack.
A winter sleep sack with a TOG rating of 3.5 is recommended for colder weather. You can also dress your baby in a pair of snuggly fleece pajamas or a heavier microfleece swaddle over standard cotton jammies.
The ideal room temperature for a baby to sleep in is between 68° and 72°F.
You should avoid dressing your baby in loose clothing, hats, pillows, blankets, or anything that could cover their face and inhibit breathing.











































