A woman is a female human. The term woman is usually reserved for an adult, with the term girl being the usual term for a female child or adolescent. The term woman is also sometimes used to identify a female human, regardless of age, as in phrases such as "women's rights". "Woman" may also refer to a person's gender identity. Women with typical genetic development are usually capable of giving birth from puberty until menopause. In the context of gender identity, transgender people who are biologically determined to be male and identify as women cannot give birth. Some inter s e x people who identify as women cannot give birth because of either sterility or inheriting one or more Y chromosomes. In extremely rare cases, people who have Swyer syndrome can give birth with medical assistance. Throughout history women have assumed or been assigned various social roles.The word woman can be used generally, to mean any female human or specifically, to mean an adult female human as contrasted with girl. The word girl originally meant "young person of either s e x" in English it was only around the beginning of the 16th century that it came to mean specifically a female child.