How to Safely Use Wearable Blankets: A Parent's Guide to SleepSacks

Quick answer

To use a wearable blanket safely, choose the correct TOG rating for your room temperature, select the right size based on your baby's weight, and always place your baby on their back in a bare crib with no loose bedding. For newborns, a SleepSack Swaddle offers a secure transition from swaddling, while older babies can use a SleepSack Wearable Blanket for unrestricted movement.

Wearable blankets, often called SleepSacks, are a safe alternative to loose blankets in the crib. They keep your baby warm without the risk of covering their face, which is a leading concern for safe sleep. Unlike traditional swaddles, wearable blankets allow your baby's arms to move freely, making them suitable for older infants who are starting to roll.

This guide walks you through the essential steps to using a SleepSack wearable blanket correctly, from selecting the right TOG and size to layering underneath and transitioning from swaddling. We'll also highlight common mistakes to avoid so you can rest easier knowing your little one is sleeping safely.

Choose the Right TOG Rating

TOG (Thermal Overall Grade) measures the warmth of a fabric. A higher TOG means more insulation. For most nurseries kept between 68-72°F (20-22°C), a TOG 1.0 or 1.5 wearable blanket is ideal. If your room is warmer, opt for a TOG 0.5 or even a lighter muslin swaddle. For cooler rooms, consider a TOG 2.5. Always check the manufacturer's temperature guide, as each brand may vary slightly.

HALO offers SleepSacks in various TOG ratings, including TOG 1.5 which is a versatile choice for year-round use in temperature-controlled homes. When in doubt, choose a lighter TOG and add a layer of clothing underneath, as it's easier to cool a baby down than to warm them up.

• Check the room temperature with a thermometer, not just your own comfort.

Select the Correct Size

Wearable blankets come in sizes based on the baby's weight, not age. A properly fitted SleepSack should be snug around the chest and armpits, with no excess fabric that could ride up over the face. The armholes should be secure but not tight. If the SleepSack has a neckline that gaps or the baby can slip down inside, it's too big.

HALO SleepSacks typically have a size chart that includes weight ranges. For example, a small size may fit 10-18 lbs, while a medium fits 16-26 lbs. Weigh your baby regularly and move up a size when they reach the lower end of the next range to ensure a snug fit. A well-fitted wearable blanket reduces the risk of overheating and ensures your baby can move their legs freely for healthy hip development.

• Always follow the weight-based size chart, not age, as babies vary in size.

Dress Your Baby Appropriately Underneath

The rule of thumb is to dress your baby in one more layer than you would wear yourself. If you're comfortable in a long-sleeve onesie, your baby may only need a diaper and a short-sleeve onesie under a TOG 1.5 SleepSack. Overheating is a risk factor for SIDS, so it's better to err on the side of caution.

Avoid using additional blankets, quilts, or pillows inside the crib when using a wearable blanket. The SleepSack replaces loose bedding, so your baby should not be wearing a heavy sweater or snowsuit underneath. A simple cotton footed pajama or onesie is usually sufficient. Check your baby's neck or chest to see if they feel sweaty or clammy—if so, remove a layer.

• Feel your baby's chest or back to check for overheating, not their hands or feet.

Transition from Swaddle to Wearable Blanket

When your baby starts showing signs of rolling, it's time to stop swaddling. The Moro reflex, which causes sudden arm movements, typically fades around 2-4 months. A SleepSack Swaddle, like the HALO SleepSack Swaddle, offers a 3-in-1 design that allows you to swaddle with arms in, hands to face, or arms out. This lets you transition gradually.

Start by leaving one arm out for a few nights, then both arms out, before moving to a wearable blanket. This helps your baby adjust to sleeping with their arms free. The HALO SleepSack Swaddle also features a double zipper for easy diaper changes, making those midnight changes less disruptive. Once your baby is comfortable with arms out, switch to a standard SleepSack Wearable Blanket.

• Start the transition during a time when you can be flexible with sleep disruptions.

Follow Safe Sleep Guidelines

Always place your baby on their back to sleep, whether using a swaddle or a wearable blanket. The crib should be bare—no loose blankets, pillows, bumper pads, or stuffed animals. The wearable blanket itself is safe, but ensure it's not too large or too warm for the environment.

Check that the SleepSack is not bunched up around the face during sleep. If the room temperature changes, adjust your baby's clothing layers rather than adding or removing the wearable blanket. Regularly inspect the SleepSack for wear and tear, and discontinue use if it becomes damaged or too small.

• Always place your baby on their back and keep the crib free of loose items.

Step-by-Step: Safe SleepSack Use

1. Check the TOG and room temperature: Use a room thermometer to confirm the temperature is between 68-72°F. Choose a SleepSack with a TOG rating that matches the room. For most homes, TOG 1.5 is a safe bet. Avoid overheating by choosing a lighter TOG if the room is warmer.
2. Select the right size based on weight: Weigh your baby and consult the size chart. The SleepSack should fit snugly around the chest and armpits, with no excess fabric. Ensure the neck opening is not too large. A proper fit prevents the SleepSack from riding up over the face.
3. Dress your baby in lightweight layers: Under the SleepSack, dress your baby in a simple cotton onesie or footed pajama. Avoid heavy layers or additional blankets. Check your baby's chest for warmth. If your baby feels sweaty, remove a layer to prevent overheating.
4. Transition gradually from swaddle: If your baby is used to swaddling, use a SleepSack Swaddle with adjustable wings. Start with arms out for naps, then move to overnight. Once your baby is rolling, switch to a regular wearable blanket. Gradual transition helps your baby adjust to sleeping with arms free.
5. Follow safe sleep practices: Always place your baby on their back in a bare crib with no loose bedding. Ensure the SleepSack is not bunched up and that the crib is free of pillows, blankets, and toys. Safe sleep reduces the risk of SIDS and accidental suffocation.

HALO SleepSack Options to Consider

• Swaddle 100% Cotton TOG 1.5: Our best-selling, award-winning SleepSack® Swaddle features a versatile 3-in-1 design (arms in, hands to face, or out!) that caters to your baby’s sleep preferences for a better night of rest. Adjustable wings make swaddling easy and the double zipper makes midnight diaper changes simple and quick. The roomy design supports healthy hip development and allows for comfortable movement while preventing the Moro reflex. This SleepSack Swaddle is perfect for newborns and infants who still need the comfort of a swaddle but are beginning to show signs of rolling. The 3-in-1 design allows you to transition gradually, and the TOG 1.5 rating is suitable for most indoor temperatures.
• essentials cotton muslin swaddle blanket 4 pack: Our Essentials Cotton Muslin Swaddle blankets are the unsung heroes of parenthood — lightweight, breathable, and endlessly useful from day one and every day after. Crafted with our signature muslin, they’re your diaper bag’s secret weapon — always ready to swaddle, shade, shield, snuggle, or soak up the unexpected. One product. Dozens of uses. Always within reach. While not a wearable blanket, these muslin swaddle blankets are excellent for swaddling newborns before transitioning to a SleepSack. They are breathable and versatile, making them a great addition to your baby's sleep arsenal.

Using a SleepSack wearable blanket is a simple and safe way to keep your baby warm and comfortable during sleep. By choosing the right TOG, size, and layers, and following safe sleep guidelines, you can ensure your little one sleeps soundly. Remember to transition from swaddling when your baby starts rolling, and always prioritize safety over convenience.