Jimmy Hanley learns that his former dancing partner has been killed, leaving a baby boy Sandy, so he takes the baby to live with him and his roommate Boris Bebenko. Theatre manager Allen Rand threatens to fire Jimmy for neglecting his work, but Jimmy's girlfriend Diana squares things by going to dinner with Rand over Jimmy's objections. Sandy catches measles and the quarantine causes Jimmy and Boris to miss a big audition.

"Sandy... wonder baby of "East Side of Heaven"... and three more laugh babies... on a hilarious lark!"