We recommend that you always leave 15cm space at the end of the sleeping bag so that your baby can move, turn around and stand up without constraint.
Size 1 / cover height 70 cm : 0-6 months
Size 2 / cover height 90 cm : 6-18 months
Size 3 / cover height 105 cm : 18 months-36 months
Sizes 2 and 3 can be folded and snapped to adjust the size to your little one.
Many parents think that from 18 months onwards their children do not want to wear a sleeping bag, in most cases this is due to an ill-fitting sleeping bag that constrains the little one's movements and prevents them from moving freely.
To find out when it's time to use a duvet, see our section here