Designed to help babies fall asleep faster and sleep longer, the weighted Zen One easily adapts to every sleep need, from birth to 6 months. The Zen One has a secure inner band that holds your baby’s arms tight to prevent wake-ups from startle reflex. For active sleepers who prefer arms free, the Zen One has quick-drying mesh sleeves that swaddle the arms up for thumb suckers. The Zen One has removable sleeves, making it a safe option for your baby once they start rolling over. 95% cotton and 5% spandex; gets softer with every wash. 2-way zipper lets babies sleep through diaper changes. Light pink shade would be great for a girl or boy. No obvious stains or rips, but please keep in mind that this is used so it is possible that you may find a very small imperfection that I missed. Size is newborn which sccording to their website, should fit up to 3 months, 7-13 lbs (3.2-6 kgs), or 19-24.5 in (48-61 cms). Ships from a smoke free and pet free home.