Really, do you have a link for that, or I can look for myself I guess. There is a link between male pattern baldness and androgen which is a male hormone, all the hormones are interconnected with each other on feedback loops, so it's not entirely out of reason to think estrogen could prevent it or whatever.
That said, baldness is hereditary, and it is passed from your mother's father, as I was taught in school, and it has checked out everywhere I have looked into it.