Police say 59-year-old Lautaro Zambrano, of Port Washington, flashed the child inside the store on Old Country Road in Westbury on Sunday.
The girl ran to her mother in the children's clothing aisle, and she notified store security.
Zambrano was caught in the parking lot and held until the police arrived.
He's charged with endangering the welfare of a child, stalking and public lewdness.
