What is Breast?
{{Infobox anatomy | Name = Breast | Latin = {{noitalic|{{wikt-lang|la|mamma}} ({{lang|la|mammalis}} 'of the breast')<ref> {{cite web |url=http://dictionary.reference.com/browse/mammal |title=mammal |publisher=Dictionary.reference.com |access-date=31 October 2011 |archive-url=https://web.archive.org/web/20111114204020/http://dictionary.reference.com/browse/mammal |archive-date=14 November 2011 |url-status=live }}</ref>}} | Image = Weibliche brust en.jpg | Caption = Morphology of human female breasts with the [[areola]], [[nipple]], and [[inframammary fold]] | Image2 = File:Male Thorax.jpg | Caption2 = Human male breasts with defined [[pectoral muscle]]s | Precursor = | System = | Artery = [[Internal thoracic artery]] | Vein = [[Internal thoracic vein]] | Nerve = | Lymph = }} The '''breast''' is an organ on the mid to upper chest area. It is just below the shoulders near the center of the upper chest region of humans and other [[primate]]s. Humans have two breasts. Both boys and girls have breasts at birth. During [[puberty]], the breasts on women grow larger and more visible. The breasts have [[mammary gland|glands]] that produce milk. [[Breastfeeding]] is when a [[mother]] [[Milk|feeds]] her baby with milk from her breasts. Men also have breasts. They are built the same way as those of women, but are usually smaller, Men cannot use their breasts for breastfeeding. Their breasts will usually not produce milk, but might become larger and produce milk during some diseases or with some [[Hormone|hormonal]] medical treatments.<ref>''Introduction to the Human Body, fifth ed.'' John Wiley & Sons, Inc.: New York, 2001. '''560'''.</ref> ==Growth and form== Girls develop breasts during [[puberty]] due to [[sex hormone]]s, mainly [[estrogen]]. The appearance and size of the breasts of a woman may vary due to [[Genetics|genetic]] factors, and the amount of [[fat]]ty and [[connective tissue]].<ref>{{cite web | url=http://www.afraidtoask.com/?page_id=119 | t