This long sleeve kimono one piece lets you dress your baby without having to pull anything overhead- a key feature if you have a wiggler By adding spandex to natural cotton muslin, Aden+Anais turned a wonder fabric into a super fabric, giving just the right amount of one-way stretch to this soft, breathable essential that will keep your baby nice and comfy.Plus, just like other Aden + Anais muslin products, this long sleeve kimono body suit gets softer with every wash.