The Baby Costume is a retired costume that was a part of its Account Upgrade in June 2005. Some pets gradually got revamps until February 2019, when a new Baby AU was relesed. Putting this costume on certain marapets will make it turn into a baby. Baby pets vary between soft pastel colors and are often seen with a pacifier, rattle, pajamas, diaper, bib, and bottle.
The old Baby Huthiq was transferred into a toddler, and was later remade in 2015.