baby adult 

An 18-20 year old human.

Mom: "Happy Birthday, son! You're 18 years old today, wow!"
Son: "Thanks, Mom. Yup, I'm an ADULT now! Legally I can do whatever I want and you can't ground me."
Mom: laughs "Adult? You're a BABY adult."

baby adult by Princess Butterfly June 26, 2017

Baby Adult 

A child who has passed the age of 18 but is still not financially independent.

My baby adult still mooches off of us

Baby Adult by LordOfMischief February 15, 2025

Adult Baby

When one dresses and acts like a baby, Having to be cared for in every way by a mommy, daddy, or both.

Adult Baby Joe has a mommy that feeds him and changes his soiled nappies

Adult Baby by Leshrec November 9, 2008

Adult Baby

Noun
Also referred to as AB
A person who acts like an infant or baby. Normally dresses up in a variety of baby like clothing like diapers, onesies, bibs, sleepers, and kid like shirts. Some adult babies find comfort and security in diapers and being cared by a mother or father. The age range for adult babies can vary from newborns to toddlers. Adult babies do not find sexual arousal out of diapers unlike diaper lovers (DL)

That Adult Baby isn't exactly the most normal. All he does is sit their like a read baby and have his mothers change him.

Adult Baby by Broken-Steel-Rocks June 29, 2009

Adult baby

An Adult that acts like a baby e.g getting their nappy changed by someone else.

"Have you seen that adult baby next door? He's so weird!"

Adult baby by Fernus123 October 14, 2015