Onesie is awesome.
On the bed: one SIDS theory is that heavier-than-air gasses can pool in anything with walls. (Google 'criblife'). One approach would be to put it on a slight incline with the head end uphill.

Crib Life by MusicKevin (Featuring Them) #criblife #hiphop #hiphopmusic #musickevin #them www.youtube.com/watch?v=e_Yu...

Fully padded, properly messy, and completely lost in the moment… diaper hood tight, crib cozy, and the buzzy wand doing its magic. Pure bliss in every sense. #DiaperHood #MessyPlay #CribLife #BuzzedAndBound

Waking up snug, secure, and completely helpless… restrained, padded, and no escape from this soggy morning. Just the way it’s meant to be. #RestrainedAndRegressed #PaddedAndHelpless #CribLife #NoControl