Children of all ages, step right up . . .and step right into our cozy FlapJack Onesies. Young'uns everywhere are crazy about our kid onesies, with their snuggy and huggy fit. Stretchy, comfy and warm, FlapJacks are a modern take on the classic long john - complete with trap door. 100% Cotton Rib fabric. Wear snug fitting, not flame resistant. Available from 6 months to age 12. Check out the matching FlapJack for Adults and for dogs.