Assuming your stance is embryos are alive: the default stance of most christians is the physical act of baptism and church rites are less important than the belief, a child incapable of understanding God would go to Heaven or Purgatory. In some sects it is not the physical birth that matters but the spiritual, your spirit is what goes to Heaven, Hell, or Purgatory when the body dies, and it can be argued embryos and newborns do not have a soul per se, just the capability to harbor one.