This rarest of blood types is defined by an unusual Rh factor that is neither negative nor positive ... was an Australian ...

If Neanderthal women mated with Homo sapiens or Denisovan men, there was a high risk of newborns having neonatal hemolytic ...

The doctor may also recommend a dose of this vaccine for the pregnant woman ... characteristics from both parents. The problem only arises when your baby is RH-positive, and you are RH-negative.