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What is best? Sleep Sack or Swaddle?

  • Sleep Sack: Hoolies’ Sleep Sack is a wearable blanket designed to keep babies and young children warm and safe during sleep. It allows for free movement of the arms and legs, ensuring that your child can move comfortably without the risk of loose blankets in the crib. The Sleep Sack is suitable for infants who have outgrown the swaddling stage and is ideal for babies who can roll over or prefer more freedom of movement.
  • Traditional Swaddle: A swaddle is a garment that wraps around a baby to restrict movement, intended to give the baby a sense of security similar to being in the womb. It’s typically used for newborns to help prevent the startle reflex, which can wake them up. Swaddles are snug around the arms and torso but are not part of Hoolies’ product offerings.

Safe Sleep Guidelines

When selecting a sleep sack for your baby, it’s crucial to adhere to the safe sleep guidelines to minimize the risk of SIDS, especially during the first few months of a baby’s life.

Safe sleep recommendations include:

  • Place infants on their backs to sleep on a firm, breathable mattress without any loose sheets.
  • Bed -sharing with your infant is strongly discouraged.
  • Room-share with the infant for at least the first six months, and ideally up to a year.
  • Keep the room temperature between 20° to 22.2°C.
  • Ensure the cot is free of any loose blankets or toys.

It can be challenging for parents who want to ensure their child stays warm to follow the no-blanket rule.

What is best? Sleep Sack or Swaddle?


  • Versatile Sizing: Fits various ages, longer lifespan than swaddles.
  • Mobility and Comfort: Free arm movement for active infants.
  • Ease of Use: No complex transitions as baby grows.
  • Safety First: Reduces suffocation risk, safer than loose blankets.


  • Startle Reflex: May need additional snugness for younger babies.
  • Comfort Adjustment: Time to adapt from swaddling to more space.
  • Proper Sizing: Essential for safety and comfort; avoid incorrect sizes.


  • Mimics Womb: Provides comfort and security.
  • Reduces Startle Reflex: Promotes better sleep.
  • Prevents SIDS: Safe when using breathable fabrics.
  • Improves Sleep: Offers a secure, calm feeling.


  • Short-term Use: Mainly for infants up to 4 months.
  • Hip Dysplasia Risk: If swaddled incorrectly.
  • Overheating Danger: Caution with layers and blanket thickness.
  • Transition Challenges: Moving to sleep sacks/bedding can be difficult

At what age should I use a swaddle, and when should I transition to a sleepsack?
Swaddles are best used for newborns and infants up to the age of 3-4 months. Once your little one starts rolling over and shows a preference for more movement, it’s the right time to switch to a sleep sack, which offers a secure yet less restrictive sleeping environment.

It is ok to use both a swaddle and a sleep sack for my baby?
It’s not advisable to use both at the same time. As your baby matures and becomes more active, transitioning from a swaddle to a sleepsack is essential for maintaining safe sleeping habits.

How do I dress my baby with a 2.5 or 3 tog sleep sack?
If the room is under 18 degrees:  Sleepsack + Cotton Onesie and Vest.
If the room is under 16 degrees:  Sleepsack + Plush Onesie

For the safest use, consider the temperature of the environment where the baby will be. It’s also advisable to follow the general rule of dressing babies in one more layer than what an adult would wear for comfort in the same conditions. If you have any concerns about the specific type of fabric item you have, it’s best to consult with a pediatrician.

Shop Our Favourite Hoolies Sleep Sacks