Joe Cobb is suffering through a toothache as well as having to babysit his little brother Rupert who won't stop crying. Every effort to calm Rupert is undone by an immediate commotion to wake him up. Joe rocks him to sleep, but then the neighbor starts playing his bass fiddle. Joe then rocks the cradle so hard it falls apart, and he trips and stumbles moving Rupert to the baby carriage, which subsequently rolls down hill through traffic with Rupert and a neighbor's monkey enjoying the ride.