Female reproductive organ development may be impacted by a mother's use of Tylenol during pregnancy, according to researchers who emphasize that their study does not prove the pain medicine is to blame and does not indicate any effect on the girls’ future fertility ↧ Tylenol use in pregnancy may be linked with uterus, ovary changes i... Female ​reproductive organ development may be impacted by a mother's use of Tylenol during pregnancy, according to researchers who emphasize that their ‌study does not prove the pain medicine is to blame and does not indicate any effect on the girls’ future fertility.