Those with 'male' on their birth certificates should complete in men's sports only or not compete at all.
It is biologically impossible to change one's gender. People can mutilate their bodies and pump them full of what are likely dangerous hormones until the cows come home, and the fact is they were born a biological male or a biological female and they can't change that. Those born with genitalia of both are so few--way under 1% of the population--as to be statistically insignificant.
Women who transgender to be pretend men are pretty much zero risk to men's sporting opportunities, scholarships, records, etc. if they participate in men's sports and men are at essentially no risk from them in public restrooms or locker rooms.
Men who transgender to be pretend women are a significant risk to women's sporting opportunities, scholarships, records, etc. when they participate in women's sports and can be a significant risk to women in public restrooms or locker rooms.
Those who champion women's rights should support every effort to keep biological males out of women's sports.