Sleep Sack and Swaddle Safe-Use Instructions

Reviewed 26 July 2026. These instructions apply to Hae Hae sleep sacks and to any product configuration that functions as a swaddle. They supplement—not replace—the product size chart, care label and advice from your child’s healthcare professional.

Before every use

• Choose the correct size. The neck and arm openings must fit securely so the garment cannot ride over the baby’s face.
• Inspect the fabric, seams, fasteners and zipper. Stop using the product if anything is damaged or loose.
• Fasten all closures provided and make sure fabric cannot cover the nose or mouth.
• Keep the baby’s face and head uncovered.

Safe sleep environment

• Always place baby on their back for every sleep.
• Use a firm, flat and level infant sleep surface with a well-fitted sheet.
• Keep the cot or bassinet free of pillows, bumpers, toys, loose blankets, sleep positioners and other soft objects.
• Do not use weighted blankets, weighted swaddles, weighted sleep sacks or other weighted sleep items.
• Dress baby for the room and check for overheating, including sweating, damp hair, a hot chest or flushed skin.

If the product is used in an arm-restricting swaddle mode

• Use this mode only while baby shows no sign of trying to roll.
• Stop the arm-restricting mode immediately at the first sign of trying to roll, even if this occurs earlier than expected.
• Do not wrap the chest tightly or restrict breathing.
• Allow the hips and legs to bend, open and move freely. Do not force the legs straight or bind them together.

When used as an arms-out sleep sack

• Make sure both arms are outside and free to move.
• Continue to use the correct size and inspect the garment before every use.
• An arms-out sleep sack does not replace any safe-sleep recommendation.

Care

Hand wash or machine wash cold. Do not bleach. Do not tumble dry. Cool iron if needed. Dry in shade.

Important limitation

This product does not prevent sudden infant death syndrome (SIDS) or other sleep-related infant deaths. Follow the advice of your child’s healthcare professional and current safe-sleep guidance.

Sources

• HealthHub Singapore: baby sleep and swaddling guidance
• American Academy of Pediatrics: safe sleep policy explained
• U.S. Consumer Product Safety Commission: safe sleep

For a format comparison, read romper vs sleepsuit vs sleep sack.

Frequently asked questions

When should arm-restricting swaddling stop?

Stop immediately when baby shows any sign of trying to roll.

Can I use a weighted sleep sack?

No. Current guidance advises against weighted infant sleep products.

Can I add a blanket over the sleep sack?

Keep loose blankets out of an infant sleep space. Dress baby appropriately for the room without adding loose bedding.