Carters is just consistent, predictable, and good quality at a reasonable price.  These are nice colors and true to size.  Perfect for playtime or wearing under a sleep sack.  I've bought cuter ones that were a lot pricier and not infrequently had issues with snaps that fall off, trim that unravels, ill-fitting leg holes, sizing issues, etc.  Carters is just a go-to brand for me now when I need the basics and these onesies are just another example.