Forced by the death of her mother to care for her three brothers and sisters, little Mona Fairfax is known to farmers of her district as Young Mother Hubbard. The children's step-father, heavily in debt and tired of the burden imposed by the little family, abandons his farm, leaving the children, penniless, to shift for themselves. The following day Daniel Banning, a wealthy "country gentleman" and owner of the Fairfax farm, calls to collect back rent. He finds Mona and her children panic-stricken over a note left by their step-father, telling of his decision to leave. Banning turns a deaf ear to Mona's pleas that she be allowed to remain on the farm with her wards. He notifies the Children's Welfare Society. Directors of the society go to the farm, load them into an automobile, and take them to the society's headquarters. At headquarters the chairman calls for volunteers to take the children into their homes.

Little Betty has a luxurious home, an army of servants and the costliest of toys. But she hasn't what a child wants most of all, other children to play with. The result is that she runs away and joins a group of children from the ghetto district on the beach. In play she exchanges clothing with a little boy. That evening Betty doesn't return home. Her maiden aunt, an over-zealous guardian, is frantic. She notifies the police. The same evening the father of the boy, who has lost his position and is facing starvation, decides to turn burglar. He steals into the home of Betty's father. The household is awakened and the intruder captured.