DS is 2.2 and sleeping in cot in the largest size of grobag you can get (I think?). Lately we have noticed that he likes to use the bumper as a pillow (he pulls it down) and also a crochet blanket for the same purpose. Is it time to give him a pillow / quilt of some sort in his cot? Don't want to move to a toddler bed until we absolutely have to! What do others do at this age?