My daughter is a female hemopheliac , a 1 in a million . The blood disorder at McMaster clinic want her for a lab rat. It would be VERY dangerous and irresponsible for her to have children. And at 23 she is fine with that, time will see if her potential partners are.
If its something she decides she wants to do, there are alternatives to having children. Wont be her own blood but she can adopt. Something I always thought to do, if it is ever found out I cant have kids.