Baby jumpsuits are one-pieces with pants. There are many styles of baby jumpsuits including sleepers, footies, footed onesies and coveralls. The defining feature of a jumpsuit is that the baby legs are covered by pants. Like the baby bodysuit and the baby romper, they come in many configurations. Look for combinations of sleeveless, long-sleeved, short-sleeved, hooded, mitted and footed jumpsuits.