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Nipple - Male

In the male, Nipples are often not considered functional, although male lactation is possible.

Starting at conception and lasting until about 14 weeks, all mammalian foetuses within the same species look the same, regardless of gender. After 14 weeks, genetically-male foetuses begin producing male hormones such as testosterone. As "female" is the "developmental default" for mammals, by 14 weeks, the nipples have already formed.

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