It's best to avoid giving pillows to kids under 2, since there's a chance that they can suffocate on the pillow while they're sleeping. Kids don't always need pillows when they're sleeping, so it's best to wait until they're older, and make sure to give them a small one, and not an adult sized pillow.
Hi! Above the age of 2. When your child is ready to move from a crib to a bed. But make sure the pillow is small and firm, about the size of an airline pillow.