My DD is 14 months old and I still wrap her. She cannot roll in bed though due having her legs in splints in bed. I think it becomes a prob when they can roll. I just wrap one arm in and leave one out. I think its just the routine of wrapping that she likes too. She now gets the other arm out too. When she was asleep I then pulled out the wrap from under her so she didn't choke herself on it. This is not working now as I have found that she is now attached to her wrap like a blankie so i am going to cut it up in pieces.

maybe your DS is used to the routine and/or the wrap too.