Most babies know that female nipples serve a purpose. Regardless, they might ask why dads have them too? From about the tenth to the fifteenth week in the womb, there is no significant difference in the development of the male and female embryos. After this, a hormonal surge occurs, and if the dad gets on the Y chromosome, then the boy begins his formation.
If there was an X chromosome, then the embryo will become a girl. However, before the hormonal surge, the nipples were already formed. After which they can no longer dissolve back into the liquid that is in the womb. So, that’s why men have nipples, because at some point (within a very short period of time) – all this is a girl.