This little sleep gown was likely made by my mother in the 50s or 60s and worn by myself or my younger brother. It appears to be cotton flannel, though there are no tags. It is an open front gown with 4 snaps at the top and a beautiful and intricate tiny rose bud detail trimmed with lace. I think this gown would fit a baby sized about 3 months and possibly up to a year, depending on the sixe of your baby.