Duvet covers From what age can my baby sleep in a duvet? It’s a matter of culture! From birth in Scandinavian countries, while in Mediterranean climes mothers swear by sleeping bags until baby is at least one year old. But there’s nothing stopping you from putting a lovely bedding set on your baby gift list. See above: FERM LIVING KIDS“Hush” organic cotton set of bed linen and half cot bumper 42