Watertown police charged Sandra M. LaBarge, 33, of 85 Public Square, Apt. B, with endangering the welfare of a child at 7:36 p.m. Friday at her residence.
Police said while she was asleep at home, her 3-year-old daughter had left the apartment and run across three lanes of traffic. Several vehicles had to stop to avoid hitting the child, they said.
She is to appear in City Court.