Don’t size up

Clothes, you size up. A sleep sack, you don’t. The chest and neck need to sit snug so the sack stays a sack — fabric around the body, not a bag they can slip down into.

This drop is 0–6 months: 56–69 cm and 4.5–8 kg. Fit it to the baby you have tonight. The legs can have room. The neck cannot.

If they’re at the top of that range, wait for 6–18. Buying this one “to grow into” is the wrong kind of generous. 6–18 and 18–36 are the same classic cut; they’re just not in this drop.

That’s why we only opened one size first. We would rather sell you the sack that stays put than the one that looks like more fabric.