>>22313547
The snaps are with enough fabric around them that they won't press into skin in most scenarios (maybe if you're riding a bike). Also, it makes sense from a design perspective because it's the narrowest spot, which is good for lots of reasons: it's good for size adjustment like this one
>>22308579 where you can see multiple rows of eyes to get a snug fit. Stresses on the fabric concentrate at the narrowest points, so putting a fastener can help keep the bodysuit closed (hook and eye) or facilitate opening (with snaps).
It also facilitates taking the bodysuit on and off by using the least amount of fasteners. Not to mention the delight of toying in that area with your fingers, teasing to pop open her crotch, exposing a new area for exploration.
