I've done both small and large for baby quilts. Not sure about a baby 'bed' quilt. Just stitching down the binding on one now and it's large - about 50 x 60. Didn't really think about the size when I saw the (free online) pattern...just liked it when I saw it. The baby will grow into it, right? I've also done much smaller - 25/30 x 40/45?
No help with receiving blanket size but perhaps if you do an internet search on that term, or look at babysrus.com for them you'll get a general idea of size for those.