A baby romper, also known as a jumpsuit, is similar to a onesie but has more leg and arm room to keep your infant covered. It is usually worn by newborns and toddlers and can range in many different prints and styles. Rompers are usually designed with the intention of making it easier to take it on or off, and quick diaper changes, making it convenient for parents when your toddler is at home or on a family stroll in the park.