Best Sleep Sacks for Safe, Cozy Baby Sleep (2026)

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A sleep sack is a wearable blanket that keeps your baby warm without loose bedding in the crib, making it a safer choice than a blanket. Look for a TOG rating matched to your room temperature, a roomy bottom that lets hips and legs move freely, and a well-fitted neck and armholes so the sack cannot slip over your baby's face. Two-way or bottom-up zippers make dark-room diaper changes far easier. Sleep sacks suit babies who have outgrown swaddling and any family wanting to follow safe-sleep guidance of a bare crib. Sleeveless designs work across seasons with the right layer underneath. A practical tip is to check the room temperature and dress your baby in one light layer under the appropriate TOG, avoid overheating, and size down rather than up, since a sack that is too big can shift and bunch during the night.