The Nightmare Before Christmas Baby Jack Skellington Costume includes: Jumpsuit Hat Officially licensed Disney Tim Burton's The Nightmare Before Christmas costume. More on The Nightmare Before Christmas Baby Jack Skellington Costume: Your little pumpkin can be the Pumpkin King in this Jack Skellington Costume. The jumpsuit is printed to look like Jack's iconic striped suit and has an attached felt bat bow tie. This baby-friendly costume has snaps for easy diaper changes. Slip on the polyknit hat printed with Jack's face to keep your little one nice and warm on Halloween night.