Apparently everyone starts off as a girl when in the womb and some will later develop into a boy, is this true? – Secondary 11

Question: Apparently everyone starts off as a girl when in the womb and some will later develop into a boy, is this true?
- Keywords:
  development,
  reproduction,
  womb
Asked by isobelbickerton to David, Jonathan, Pete, Sam on 3 Jul 2012.
- Pete Etchells answered on 3 Jul 2012:
  
  It’s not quite true! Early on in the development stage, the foetus has what’s known as ‘undifferentiated’ sex organs, which basically means that they’re neither a girl nor a boy. Depending on whether they have a Y chromosome or not, these organs will then differentiate into either the male or female versions.

Question: Apparently everyone starts off as a girl when in the womb and some will later develop into a boy, is this true?