Well how can I put this I'm 31 weeks and when my son hears my daughter's father voice he will move like crazy, sadly when he hears his dad voice nothing happens. Which is his father aka sperm donor fault he cheated on me when I was three months and he hit me and kicked me while I was pregnant. the only male voice he has heard was my daughter's father voice. What am I kidding I think he knows I'm still in love with his sister father?