Plump, a bachelor wastrel who drinks too much and sleeps until noon, learns that his uncle, who thinks Plump is married with a baby, will arrive for a visit in two hours. He throws cash at the building's errand "boy," a small man who goes about grabbing or renting small children from their mothers then bribing various women to pose as Plump's wife. As Uncle John's arrival nears, Plump in desperation swaddles the errand boy and puts him in the crib. With various infants and women coming in and out, and several men looking for their lost babies or lost wives, will Plump pull off his deception?