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What's the difference between a sleepsuit and a sleep sack?

A sleep sack has closed legs (or an opening at the bottom) and keeps the legs together for sleep. A sleepsuit has separated legs — the baby can stand, walk, and crawl in it. The sleepsuit is the wearable blanket for walking toddlers who still need TOG warmth at night.

When should I switch my baby from a sleep sack to a sleepsuit?

When the baby is walking confidently in the crib, usually 12–15 months. The closed-leg sleep bag becomes a trip hazard at that point. Some families switch earlier if the baby protests the closed-leg format.

Can a baby wear a sleepsuit year-round?

At 1.0 TOG, yes — in a 69–75°F nursery, which is the most common US nursery temperature. For warmer summer nights above 75°F, switch to lighter pajamas alone. For cold winter rooms below 68°F, layer a long-sleeve bodysuit underneath.

Why are the sleepsuits sleeveless?

Closed sleeves are how you overheat a baby overnight. The warmth math sits in the body of the suit, not the limbs. Sleeveless construction also makes it easier to dress a sleepy toddler at 7:30 p.m.