Aaahh!!! Real Monsters (1994)

S3E7 Baby It's You

Ickis, Krumm, and Oblina find themselves tasked with babysitting the Gromble's nephew, Bomble. They decide to bring him along on a garbage scavenging adventure at a nearby hospital, but things go awry when Bomble is mistakenly exchanged for a newborn human baby. The three friends must now race against time to locate Bomble at his new human "family's" house and swap him back with the human infant before anyone notices the mix-up.