baby all-in-one; baby jumpsuit with front snaps
A one-piece baby garment that opens fully down the front with snaps, similar to a jumpsuit. Wasei-eigo from English 'baby all'.
wasei-eigo (Japanese-coined English), from baby all
I received a cute baby all-in-one as a baby gift.
Baby all-in-ones are easy to change because they open in the front.