North American An infant’s one-piece close-fitting lightweight garment, usually having sleeves but leaving the legs uncovered and fastening with snaps at the crotch.
- One vendor was even selling a baby's pink onesie emblazoned with the New York Police Department logo.
- These days you can buy your baby daughter a BORN TO SHOP onesie with little pink purses on it.
- As you can tell from his onesie, I exclusively breastfeed.
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