Would the baby have nanoprobes from Icheb though? How many nanoprobes are in a sperm? Would the Borg have tweaked the males so that nanoprobes were included in sperm production? Seems unlikely since they don't generally breed. But there would be some breeders because though less efficient the Borg do everything and there is probably a plan going on to breed super Borg. However your average Borg, can't see it. But just because there are no nanoprobes in the sperm designed to become embryo nonprobes doesn't mean there aren't nanoprobes randomly floating around in semen and they wouldn't latch onto a new life, the embryo, and assimilate it. So perhaps there would be some Icheb nanoprobes there after all.