The medical definition of infertility (sterility) is a couple of childbearing age who are sexually normal, cohabiting, not using contraception, and have never had a pregnancy within 1 year. Infertility is defined as a woman who has had a pregnancy but has not actually been able to have a child, ending in miscarriage, premature birth, stillbirth or stillbirth. A woman who has never been pregnant after marriage without separation and without contraception is called primary infertility, while a woman who has been pregnant without contraception for two consecutive years is called secondary infertility. Likewise, infertility is divided into primary and secondary infertility.