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(For other ways in which men commonly differ physically from women, see man.) During early fetal development, embryos of both sexes appear gender-neutral.As in cases without two sexes, such as species that reproduce asexually, the gender-neutral appearance is closer to female than to male.Referring to an unmarried female human as a woman may, in such a culture, imply that she is sexually experienced, which would be an insult to her family.There are various words used to refer to the quality of being a woman.The term "womanhood" merely means the state of being a woman, having passed the menarche; "femininity" is used to refer to a set of typical female qualities associated with a certain attitude to gender roles; "womanliness" is like "femininity", but is usually associated with a different view of gender roles; "femaleness" is a general term, but is often used as shorthand for "human femaleness"; "distaff" is an archaic adjective derived from women's conventional role as a spinner, now used only as a deliberate archaism; "muliebrity" is a neologism (derived from the Latin) meant to provide a female counterpart of "virility", but used very loosely, sometimes to mean merely "womanhood", sometimes "femininity" and sometimes even as a collective term for women.
An imbalance of maternal hormonal levels and some chemicals (or drugs) may alter the secondary sexual characteristics of fetuses.
The breast evolved from the sweat gland to produce milk, a nutritious secretion that is the most distinctive characteristic of mammals, along with live birth.
In mature women, the breast is generally more prominent than in most other mammals; this prominence, not necessary for milk production, is probably at least partially the result of sexual selection.
For instance, intersex individuals, who have mixed physical and/or genetic features, may use other criteria in making a clear determination.
At birth, babies may be assigned a gender based on their genitalia.