Stanislawa Leszczynska was born on May 8th, 1896, in the Bałuty neighborhood of Lodz, Poland. She was the oldest of three children of Jan Zambrzycki and his wife Henryka. She completed high school in 1914 and 2 years later she married printer Bronisław Leszczynski. In 1920, Stanislawa and Bronislaw with their two children Bronisław and Sylwia, moved to Warsaw where she enrolled in the midwife college and completed her studies. In 1922, they moved back to Lodz where she got a job as a midwife. There , she gave birth to her second son Stanisław and in 1923 her third son, Henryk was born.