First of all, you should make sure that she is in the right condition to be having a baby. You can check whether she is ovulating by feeling her up with your bare hand, if she is not then she is probably not ready for lovemaking. Secondly, once you have ascertained that she is ovulating, then you can begin stimulating the baby by gently massaging her vagina with your thumb and fore finger. Use both hands at the same time and make sure you are not overdoing it. Once she is about to reach her peak, you can now use your big baby-doll to penetrate her as deeply as you can.