
The Halo Sleep Sack is a wearable blanket designed to keep babies warm and comfortable while sleeping. It is a trusted brand in the U.S. for over 25 years, with a mission to create simple and innovative products that promote safe sleep for babies. The Halo Sleep Sack comes in various materials, such as cotton, micro-fleece, and bamboo, and features a 3-way adjustable design to fit a baby's sleep style. It is recommended to slip the Sleep Sack over a baby's regular sleepwear and secure it using fastener strips. The product is designed for newborns up to 6 months old, and it is important to choose the appropriate size and weight for your baby. While the Halo Sleep Sack has received positive reviews for its softness, comfort, and ease of use, some users have expressed concerns about the sizing and the Velcro fasteners. Overall, the Halo Sleep Sack is a popular choice for parents seeking a safe and comfortable sleeping solution for their babies.
| Characteristics | Values |
|---|---|
| Brand | HALO |
| Product | SleepSack® |
| Product Type | Wearable blanket |
| Product Variants | Swaddle, Sleeping Bag, BassiNest, Bamboo SuperSoft SleepSack, Micro-Fleece SleepSack, Cotton Muslin Wearable Blanket, Cotton Wearable Blanket |
| Product Features | Adjustable, Soft, Cozy, Secure, Lightweight, Hip Healthy, Easy Transition, Safe, Generously-Sized Fasteners, Roomy, 'Back is Best' Embroidery |
| Intended Users | Newborns, Infants, Babies |
| Age Range | 0-6 months, 3-6 months, 6-12 months, 10 weeks, 6 months, 2-24 months |
| Weight Range | 6-12 pounds |
| Temperature | TOG values ranging from 0.2 to 3.0 |
| Safety | Safe for babies who can roll, prevents 'Moro' or startle reflex, prevents overheating, prevents loose fabric from covering the face |
| User Feedback | Positive reviews for softness, comfort, ease of use, safety, and quality. Negative reviews for sizing issues, Velcro, and zipper placement. |
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What You'll Learn

Ensure the correct size for your baby's age and weight
It is important to ensure that you are using the correct size Halo Sleep Sack for your baby's age and weight. Using the wrong size could be unsafe for your baby.
Halo Sleep Sacks come in various sizes, from small to extra-large, and the size you need will depend on your baby's weight and length. When choosing a size, it is important to consider your baby's current measurements, as well as their expected growth. It is generally better to choose a slightly larger size that your baby can grow into, rather than a size that may become quickly outgrown.
Each Halo Sleep Sack should have a weight and length range listed on the packaging. For instance, a small Sleep Sack might cater to babies within a certain weight range, such as 10 to 18 pounds (approximately 4.5 to 8 kilograms), while a medium could accommodate a higher weight range, such as 16 to 24 pounds (approximately 7 to 11 kilograms). These ranges may vary slightly depending on the specific style or model of the Sleep Sack, so be sure to refer to the product information for the Sleep Sack you are using.
When selecting a size, take into account your baby's build as well. If your baby is longer in length or their weight falls towards the higher end of the range, sizing up may be beneficial to allow for more comfortable movement and growth. Conversely, if your baby's weight and length are on the lower end of the range, opting for the smaller size may ensure a snug and safer fit.
Remember, the Halo Sleep Sack should fit snugly around your baby's torso, providing enough space for them to kick their legs freely. The armholes should not restrict your baby's movement. If the Sleep Sack appears too tight or your baby shows signs of discomfort, consider moving up a size to prioritise their comfort and safety.
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Account for the TOG value of clothing worn underneath
When using a Halo Sleep Sack, it is important to account for the TOG (Thermal Overall Grade) value of the clothing worn underneath. The TOG value is a measure of the thermal insulation of a fabric, indicating how effectively it can trap warm air close to the body. This is particularly important when using a sleepsack or sleeping bag as they come in different TOG ratings, and you want to ensure your baby is comfortable and safe while sleeping.
The TOG rating of baby sleepwear takes into account factors such as the type of fabric, the thickness of the material, and the construction of the garment. A higher TOG rating indicates that the sleepwear provides more thermal insulation and is suitable for colder temperatures, while a lower TOG rating is appropriate for warmer temperatures. For example, if the room temperature is 75°F (24°C) or higher, a TOG value of 0.5 to 1.0 would be suitable for your baby's sleepwear, providing a light layer of insulation without overheating them. On the other hand, if the room temperature is between 61°F (16°C) and 68°F (20°C), a TOG value of 2.5 to 3.5 would be more appropriate.
When dressing your baby in a Halo Sleep Sack, consider the TOG value of each layer of clothing. For instance, if you dress your baby in a Halo Sleep Sack with a TOG of 1 over a cotton bodysuit with a TOG of 1, the total TOG value is 2. It is important to note that the Sleep Sack swaddle values are slightly higher as they account for the additional layers of the swaddle wrap. As a general rule, dress your baby in one layer more than an adult would wear to be comfortable in the same environment.
Additionally, it is recommended to avoid using loose blankets in the crib for babies under one year old due to the risk of suffocation. The Halo Sleep Sack is designed to eliminate the need for loose blankets and provide a safe and comfortable sleeping option for your baby. To ensure your baby's comfort and safety, consider using a room thermometer to gauge the temperature of their sleeping environment and adjust the TOG rating of their sleepwear accordingly.
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Use the swaddle feature with arms in, out, or hands-to-face
The Halo Sleep Sack is a swaddle designed to soothe infants and help them sleep better. It is the only 3-way adjustable swaddle, allowing you to adjust to your baby's sleep style. Here are some tips for using the swaddle feature with arms in, out, or hands-to-face:
Arms-In:
This position is recommended for reducing the startle reflex. To do this, wrap your baby tightly in the Halo Sleep Sack, ensuring that the swaddle is secure around their arms and body. The Halo Sleep Sack has a spacious design that won't restrict your baby's legs and promote optimal hip growth. Make sure to follow the instructions on the sack for a safe and proper fit.
Hands-to-Face:
This position allows your baby to self-soothe by having access to their hands. To achieve this, adjust the swaddle wrap so that your baby's arms are brought up towards their face. The adjustable design of the Halo Sleep Sack makes it easy to transition between different arm positions.
Arms-Out:
The arms-out position is ideal for transitioning your baby out of swaddling. Place the swaddle band under your baby's arms, allowing them to move their arms freely. This position is recommended for babies who show signs of wanting to break free from the swaddle or are starting to roll over.
It's important to ensure that the swaddle is secure and doesn't ride up towards your baby's face. If you notice the swaddle riding up, try adjusting the position of the swaddle wings or placing the swaddle lower on your baby's body. Additionally, always place your baby on their back to sleep, as recommended by the "Back is Best" phrase on the Halo Sleep Sack.
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Discontinue swaddling when the baby can break free or roll over
When your baby can roll over or break free from their swaddle, it's time to discontinue this practice for safety reasons. A baby who can roll over while swaddled is at risk of ending up in a dangerous position that may restrict their breathing.
If your baby is breaking free from their swaddle, it means they are likely ready for more freedom of movement. You can transition them to a sleep sack, which still provides a cozy and enclosed feeling but allows their arms and legs to move freely. Sleep sacks are designed to be roomy enough for your baby to kick and move their limbs, promoting healthy hip and joint development.
To ensure a smooth transition, introduce the sleep sack gradually. Start by using it for naps during the day, so your baby has a chance to get used to the new sensation of having their arms free. If they are used to being swaddled tightly, they may startle themselves with their newfound freedom, so give them time to adjust.
Once they are comfortable napping in the sleep sack, you can start using it for bedtime. Keep the room at a comfortable temperature to prevent them from getting chilly without the swaddle. You can also pair the sleep sack with a lightweight onesie or sleeper to provide extra warmth and familiarity.
It's important to prioritize your baby's safety and comfort during this transition. If they are struggling to adjust to the sleep sack, don't force it. Each baby is different, and some may take more time to get used to new sensations and routines. Gradually phase out the swaddle by loosening it each night, allowing them to adjust to having more movement until they are ready for the sleep sack full-time.
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Transition to the sleeping bag gradually
If your baby is used to being swaddled, it's best to transition them slowly to the Halo Sleep Sack. Start by swaddling with one arm out for several nights. This will allow your baby to adjust to having a little more freedom of movement while still feeling secure. After a few nights, you can then move to swaddling with both arms out. This step is important to help your baby get used to self-soothing and having their hands free. Once they seem comfortable with this, you can introduce the sleep sack.
On the first night with the sleep sack, dress your baby in a lightweight sleepsack and place them in their sleeping environment. You may want to use a pacifier or offer a finger to suck on to help soothe them to sleep. For the first few nights, your baby may need a little extra help settling, so you can introduce a gentle sleep aid, such as a mobile or gentle music. White noise is also a great tool to help soothe your baby and create a consistent sleep environment.
After a few nights, your baby should be adjusting to the new sleep arrangement. Continue to offer comfort and support, but start to reduce the amount of time you spend settling them. This will help your baby learn to self-soothe and settle independently. If they are waking frequently, try offering a dream feed before you go to bed to help them sleep through the night.
The key to a successful transition is to take it slowly and give your baby time to adjust. Each baby is different, so the transition period may vary. Some babies may take to the sleep sack quickly, while others may need more time. Be patient and consistent, and your baby will soon be sleeping soundly in their new sleep sack.
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Frequently asked questions
The Halo Sleep Sack is a wearable blanket designed to keep babies warm and comfortable while sleeping. It is a safe alternative to loose blankets, which can pose a risk of suffocation.
Simply slip the Sleep Sack over your baby's regular sleepwear and secure it using the fastener strips. The Sleep Sack is adjustable, so you can choose to have your baby's arms in or out.
The Halo Sleep Sack is suitable for newborns up to 6 months old. It features a 3-way adjustable design that allows you to customise it according to your baby's sleep style.
It is important to ensure that the Sleep Sack is the correct size for your baby. Make sure that your baby cannot wiggle out of the arm or head holes, and that the neck part cannot go over their nose.
When your baby starts to break free from the Sleep Sack or roll over, it is time to transition to a sleeping bag. Halo recommends gradually transitioning by swaddling your baby with one arm out, and then eventually with both arms out, before introducing the sleeping bag.








































