The Baby Costume is a retired costume that was a part of an Account Upgrade in June 2005. Some pets gradually got revamps until February 2019, when the Baby AU returned. Putting this costume on certain marapets will make it turn into a baby. Baby pets vary between pastel colors and are often seen with a pacifier, rattle, pajamas, diaper, bib, and bottle. They can be mistaken for Chibi pets or bigger variants of Minipet pets; only Baby pets' distinguishable parts are less developed than their older counterparts.