Beavis and Butt-head - Season 2 Episode 4
Baby Makes Uh, Three

Buzzcut divides the class into boy/girl pairs, and assigns each a ""sugar baby"" which they must care for and nurture for one week. Beavis and Butt-head are paired together (as each girl in the class has refused to be assigned to them), and promptly give their "baby" a bath -- in a stream.