Santa Baby Onesie® Retro Christmas Santa Onesie® - Cute Christmas Bodysuit - Holiday Baby Onesie® Here's an adorable Olaf Appliqued One Piece Romper for Baby Boy's and Girls. This can be worn to a Disney trip a costume for Halloween, theme Birthday or an everyday cute comfy outfit. The fabric is a stretch cotton knit. There is snaps at the crotch for easy changing.