The zoo announced Thursday that the baby gorilla, named Kassiu, was born March 19 to 13-year-old mother Naku and 27-year-old father Cassius.
Kassiu is the first offspring of both Naku and Cassius. Zoo officials say both the mother and baby are doing well.
The zoo's animal care staff is fairly certain the infant is a female but hasn't had a chance to get a detailed look yet.
The Milwaukee Journal Sentinel reports the baby joins three adult female and three adult male gorillas at the zoo.