LO is 9 weeks and lives exclusively in 1-piece sleepers (and I think they're all Carters brand!) We were gifted a ton of onesies, both long and short sleeves, but we NEVER use any of them! Before, I always assumed that every baby wears onesies, but it's cold in Chicago and I don't want to bother with pants! Plus, getting them over his big head is not easy, haha. And sleepers are cute, cozy, and easy to wear! It's just too bad about all the wasted onesies though...