A small baby or child that is unable to walk, thus necessitating that it be carried in the arms of an older person.
Look at that ho Shantell, she gots two kids in diapers an a Arm baby.
by Dimitriou January 01, 2008
An African-American baby who is being held by it's mama, while the older child stands by the mama's knee, or kneebaby.
"I's an armbaby when my siser died."
by bagitbabe May 16, 2008