if you use modern cloth nappies, the singlet suits with the snaps under the crotch, don't fit right over the nappy.

my nb was in mostly singlets and nappy for her first two summers (at home).

you'll prolly get given singlets too, it's a popular thing with baby gifts (teddies and singlets, we got heaps given).

within a short time of bubs arriving, just by putting clothes on them daily, you'll soon work out
- what fits them best
- what is easiest for YOU to get on and off them easily
- which brands wash up nice and stay soft
that practical experience informs your buying choices, really fast.