Physically, We All Began As Female

News: The Curiosity Podcast is here! Subscribe on iTunes, Stitcher, Google Play Music, SoundCloud and RSS.

Men have nipples because they are formed before the activation of the Y chromosome in embryonic development.

Advertisement

Love getting smarter? Sign up to our newsletter and get our best content in your inbox!

We were all female

None

Share the knowledge!

Key Facts In This Video

  1. Physically speaking, all humans were once "female" in the womb—though some prefer to say we were gender neutral. 00:02

  2. The first 5–6 weeks of embryonic development involve only the X chromosome, not the Y chromosome. 00:32

  3. Nipples form before the activation of the Y chromosome in embryonic development. 01:28

Advertisement