Marilyn Monroe was born Norma Jeane Mortenson in Los Angeles, California, United States on June 1, 1926; she was the third child of Gladys Pearl Baker (née Monroe, 1902–1984). Gladys, the daughter of two poor Midwestern migrants to California, was a flapper and worked as a film negative cutter at Consolidated Film Industries. When Marilyn was fifteen, Gladys married a man nine years her senior, John Newton Baker, and had two children by him, Robert (1917–1933) and Berniece (born 1919). She filed for divorce, and Baker took the children with him to his native Kentucky.
In 1924, Gladys married her second husband - Martin Edward Mortensen - but they separated before she became pregnant with Monroe by a different man; they divorced in 1928. The identity of Monroe's father is unknown and Baker was most often used as her surname. Marilyn Monroe, experienced a disrupted, loveless childhood that included two years at an orphanage. Norma was left to a series of foster homes and the Los Angeles Orphans' Home Society.