I don't think anything has really been established as to the source of the infection. Even calling it an infection is an assumption, so far. Blood and air are out as modes of transmission thus far. I think only bites, possibly scratches, have changed anyone. The not crossing species thing is indicative of a virus, though, isn't it? Can't say I know much about it, really, but with all the theories out there as to the source of the zombies, who knows what may happen to a child born in that environment. Could be alien crossbreeding, or pollinated, or mutated...
Frankly, I would be scared to bring a child into that environment, especially with the source of the predicament so unknown. It could turn into its own set of horrors. *shudder*
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