Gynaecology is the branch of physiology and medicine which deals with the functions and diseases specific to women and girls, especially those affecting the reproductive system. Obstetrics deals with all aspects of pregnancy; from prenatal care to post-natal care. An obstetrician delivers babies, and provides therapies like fertility treatment to help a woman get pregnant. Most OB/GYN is trained to do all of these things. Other conditions and issues related include infertility and its associated issues like polycystic ovarian syndrome (PCOS) and cancers affecting the reproductive organs like the uterus, cervix and ovaries.