RE: When is it safe to...
Does your baby get cold enough at night to need a blanket? Mine is a little steam generator at night. She only sleeps in a onesie and is still very hot to the touch. And like Sue said, mine moves around so much, that there's no way she would stay covered by a blanket even if I used one... I also have a blankie toy called a "Lovie" (by Dakin) in her crib which is her comfort toy/sleep aid and a few very small little stuffed toys in there as well that I added at about 6 months. I figured once she was moving around the crib and turning over on her own that it was OK.
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)