
Sleep sacks are wearable blankets designed to help babies sleep comfortably and safely. They are a safe alternative to loose blankets, which can pose a risk to newborns. Sleep sacks are designed to keep babies warm and comfortable while allowing them to move their arms and legs freely. They are made from breathable and gentle fabrics that help regulate body temperature and are available in different sizes and weights to suit the season and the baby's needs. Sleep sacks are recommended by the American Academy of Pediatrics (AAP) as a safe alternative to swaddling once babies start to roll over. They are easy to use, with zippers or clasps, and can help establish a consistent sleep routine for infants.
| Characteristics | Values |
|---|---|
| Safety | Sleep sacks are among the safest sleepwear for newborns. They allow newborns to roll over and move their arms and legs freely. |
| Temperature Regulation | Sleep sacks help regulate a newborn's body temperature, creating a comfortable sleep environment. |
| Blanket Alternative | Sleep sacks eliminate the need for loose blankets in the crib, reducing the risk of entanglement and SIDS. |
| Ease of Use | Sleep sacks with zippers and clasps facilitate easy diaper changes during the night. |
| Fabric | Breathable and gentle fabrics like cotton, bamboo, and rayon blends are ideal for newborn skin. |
| Size | It is essential to choose the right size sleep sack for newborns to ensure safety and mobility. |
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What You'll Learn

Safe alternative to blankets
Sleep sacks are a safe alternative to blankets for newborns. They are wearable blankets that help regulate body temperature and provide a seamless transition from swaddling, ensuring newborns stay cozy and warm without the need for loose blankets. They are designed with gentle, breathable fabrics and come in various sizes to accommodate babies of different lengths and weights. Sleep sacks with sleeves are also available for newborns who prefer a more traditional swaddle.
The sleeveless design of sleep sacks allows newborns to move their arms freely and adjust their position as needed. They can roll over or roll back, ensuring they can always get themselves comfortable. The sacks also prevent tangling, providing a safe and secure night's sleep.
When choosing a sleep sack, it is important to consider size, fabric, and TOG rating. The right size will provide a balance between being too tight and too loose, with a bit of "kicking room". Fabric and TOG rating are crucial for temperature regulation. Breathable and gentle fabrics are ideal, with a lower TOG rating (around 1.0 or lower) for warmer rooms and a higher rating (2.5) for colder temperatures.
Sleep sacks are a safe choice once newborns start to roll over, as recommended by the American Academy of Pediatrics (AAP). They eliminate the risks associated with loose blankets in the crib and help establish a consistent sleep routine by cueing infants that it's time for sleep. With their temperature-regulating design, soft materials, and practical features such as two-way zippers for easy diaper changes, sleep sacks provide a safe and comfortable sleep solution for newborns and their parents.
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Temperature regulation
When choosing a sleep sack, it is important to consider the fabric and the TOG rating. The fabric should be breathable and gentle on the baby's skin. Some sleep sacks are made from natural materials such as cotton or bamboo, which are known for their breathability and softness. Others are made from innovative blends, such as CloudBlend™, which offers the ideal balance of coziness and breathability.
The TOG rating indicates the warmth of the sleep sack. A lower TOG rating, such as 1.0 or lower, is suitable for warmer temperatures, while a higher rating, such as 2.5, is better for colder environments. It is important to dress your baby appropriately under the sleep sack, depending on the temperature. In colder weather, warmer clothing such as footed pajamas may be necessary, while in warmer months, a light onesie may be sufficient.
Sleep sacks are designed with sleeves or without, allowing for different levels of warmth. They also come in various sizes to accommodate babies of different lengths and weights. It is important to choose the right size to ensure the baby's comfort and safety. A sleep sack that is too tight may restrict the baby's movement, while one that is too loose may pose a safety hazard.
By using a sleep sack, you can ensure that your newborn maintains a comfortable temperature while sleeping, promoting a restful night's sleep for both the baby and the parents.
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Crib and bassinet safety
Cribs and bassinets are both safe for newborns as long as you follow safe sleep guidelines. The American Academy of Pediatrics (AAP) recommends that parents choose either a freestanding crib or a bassinet for their baby. The AAP advises against using a co-sleeper or any other type of sleeping device that attaches to the parent's bed.
- Always place the baby on their back to sleep, never face-down or on their side.
- Use a firm mattress with tight-fitting sheets.
- Do not use sleep positioners or any other type of sleeping aid.
- Keep soft objects, toys, and loose bedding out of the crib or bassinet. This includes pillows, blankets, and stuffed animals.
- Make sure the baby's clothing is not loose, as it could pose a risk of entanglement or suffocation.
- Room-share with the baby until at least 6 months of age. This means keeping the baby's crib or bassinet in the same room as the caregiver, preferably within arm's reach.
- Follow the manufacturer's guidelines for weight and age limits. Do not use a crib or bassinet that is too old or modified.
- Choose a bassinet with mesh walls for better breathability.
- Do not move the bassinet with the baby inside.
- Be aware of the specific safety standards for bassinets, such as weight and size limits, and the height of the sides to prevent the baby from falling out.
- For cribs, ensure that the slats or bars are no more than 2-3/8 inches (6 centimetres) apart so that the baby's head cannot slip through.
- Avoid using second-hand cribs or bassinets if possible, as they may not meet current safety standards or may have been damaged during previous use.
- If using a second-hand crib or bassinet, thoroughly inspect it for any defects or loose parts, and ensure that it meets current safety regulations.
Additional Considerations:
- Sleep sacks are a safe alternative to loose blankets and can be used in a crib or bassinet. They provide warmth and comfort while allowing the baby's arms to move freely.
- When using a sleep sack, ensure that it is the correct size for the baby and that their clothing underneath is appropriate for the temperature.
- Newborns may benefit from sleeping in a bassinet initially, as it provides a smaller and cozier space similar to the womb. However, they will likely need to transition to a crib as they grow.
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Choosing the right size
When choosing a sleep sack for your newborn, it's important to select the right size to ensure your baby's comfort and safety. Here are some tips for choosing the right size:
- Consider your baby's age and weight: The size of the sleep sack will depend on your baby's age and weight. Most sleep sacks come with age and weight guidelines to help you choose the right size. Make sure to refer to the manufacturer's size guide to select the appropriate size for your baby's age, height, and weight.
- Ensure a snug fit: The sleep sack should fit snugly around your baby's body. It should be snug around the arms, neck, and chest but allow enough room for leg movement. The armholes should be sized appropriately to prevent the baby's arms from slipping inside while allowing freedom of movement.
- Avoid excess fabric: The neckline should rest below your baby's chin without being too loose. Avoid excess fabric around the neck, as it can pose a safety hazard. The length of the sack should not exceed your baby's feet to prevent tripping or bunching up around their face.
- Allow for growth: Babies grow quickly, so it's important to choose a sleep sack that fits well now but also allows for some growth. Regularly check the fit and be prepared to size up when needed.
- Consider the season: Depending on the season, you may need a larger or smaller sleep sack. In colder months, you might opt for a larger size to accommodate extra layers of clothing underneath, while in warmer months, a smaller size might be more comfortable.
- Choose the right TOG rating: The TOG (Thermal Overall Grade) rating indicates the warmth level of the sleep sack. Select a TOG rating that is appropriate for the temperature of your baby's room. A higher TOG is suitable for cooler environments, while a lower TOG is better for warmer settings.
- Prioritize safety: An ill-fitting sleep sack can pose safety risks. A sleep sack that is too large can ride up and cover your baby's face, impeding their ability to breathe. On the other hand, a sack that is too small can restrict their movement and natural development.
- Look for adjustable features: Opt for sleep sacks with adjustable features such as shoulder snaps and a wide neckline, which can accommodate your growing baby and extend the use of the sleep sack.
- Have a few on hand: It's recommended to have at least two to three sleep sacks to account for messes, accidents, and laundry. This way, you'll always have a clean one ready when needed.
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Dressing your baby appropriately
When it comes to dressing your baby appropriately for sleep, one of the most important considerations is their sleeping environment. Are they sleeping in a cold or warm room? This will determine the type of clothing and bedding you choose for them.
In a colder room, you might opt for warmer clothing, such as footie pyjamas or a onesie with feet, and a sleep sack with a higher tog rating, such as 2.5. The tog rating indicates the warmth of the sleep sack, with higher ratings being better for colder temperatures. You can also choose a sleep sack made from a warmer fabric, such as micro-fleece, to keep your baby snug.
In a warmer room, it's important to ensure your baby doesn't overheat. Dress them in lighter clothing, like a light onesie or a short-sleeve pyjama set, and choose a sleep sack with a lower tog rating, such as 1.0 or lower. Look for sleep sacks made from breathable fabrics, such as cotton or a linen-cotton blend, to help regulate your baby's body temperature and keep them comfortable.
The size of the sleep sack is also crucial. It should fit your baby's current weight and size with a bit of room for kicking, but not be too loose or too tight. A sleep sack that is too big can pose a hazard, as the extra material may bunch up around your baby's face.
Sleep sacks are a safe and practical choice for newborns and babies as they grow. They allow freedom of movement for your baby's arms, hips, and legs, and they can push themselves up when they start to roll over. Sleep sacks also eliminate the need for loose blankets, reducing the risk of SIDS and tangling. Many sleep sacks feature easy-to-use zippers for quick diaper changes and are designed with gentle, hypoallergenic fabrics that are soft on your baby's skin.
By choosing the right size, fabric, and tog rating for your baby's sleep sack, you can ensure they stay comfortable, safe, and snug throughout the night.
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Frequently asked questions
Yes, sleep sacks are safe for newborns. They are among the safest sleepwear you can choose for your baby. However, it's essential to choose the right size and type of sack to ensure a safe night’s sleep. Look for one that’s specifically labelled a newborn sleep sack.
The right size is always about finding the balance between being too tight and too loose. You can rely on manufacturer guidelines, which typically go by weight and height, as opposed to age, for more accurate sizing.
Yes, you can put your baby in a onesie with feet during colder weather, or a light onesie during warmer weather.











































