I always had a top sheet with a comforter growing up. My DH only used a fitted sheet with a comforter as a kid. We are getting DD a big kid bed (twin size) and she has only slept with a blanket and fitted sheet so far since her crib converted to a toddler bed. She is just about 4 yrs. old. I already bought her a full sheet set, but since I want to have extra sheets on hand for potty accidents, I was thinking of just getting some extra fitted sheets.

What do you do? If your DC uses a top sheet, how old were they when they started using one?