The On The Move Sleeping Bag comes in two sizes, Medium and Large. The Medium sized sleeping bag is from 6 to 18 months (up to 33 in or 83.8 cm), while the Large sized bag is optimal for toddlers from 18 to 36 months (up to 38 in; 96.5 cm). It has adjustments both at the shoulder and the legs so you can get the right fit as your baby grows.