One-Piece Outfits can be described as rompers, one-piece outfits, union suits, baby pajamas, footed pajamas, sleep n play, or other forms of baby sleepwear.
The most popular of the one-piece outfits category would be the
"sleep n play" items. These are one-piece full-body baby clothes that cover your infant from toes to collar and cuffs. The button snaps on the front go from the collar all the way down to the crotch to allow for easy, no-fuss dressing.
Similar to the Sleep N Play are the
union suits. These are one-piece baby clothes that are still built like pajamas, but don't have the attached feet. Instead of slippered feet sewn on they have a more traditional pant cuff. A fashion benefit of this is that you can then accent baby's outfit with cute
baby socks! A practical benefit is less time trying to situate baby's feet inside that single-piece outfit.
When baby is newborn, though, pajamas and sleepwear with legs is less popular than an
infant gown. These staples of baby sleepwear have full-length arms, and the hem of the gown is cinched a bit to help it stay in place when baby's legs get to moving during sleep. Gowns are typically less ornamented than other sleepwear, much of which doubles as playwear, since they're very rarely seen by anyone but mom and dad, and because fewer decorations mean less chance of one of them coming loose somehow and presenting a possible choking hazard while baby is sleeping. Since they are usually only used on newborns, the gowns don't actually get made larger than that initial 0-3 months size.
Since the items in the
baby sleepwear section have legs, they're subject to a different level of restrictions for safety if they get too large. For that reason many sleepwear items by baby clothing companies only go as large as 9 months. They're still made from a variety of fabric styles, though, including: popcorn or basket weave, terry, velour and interlock combed cotton.
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