stiles-dimples:

Hey, hey, there are so many things wrong with this “Hayley’s baby has Klaus’s vampire blood so it’s healing her.”

• Vampirism isn’t in the DNA so it can’t be passed onto the baby.
• For werewolves to not have an extreme allergic reaction to Klaus’ blood, they need to ingest the human Doppelgänger’s blood, which Hayley has not done.
• Vampires and werewolves do not mix (hence the above problem without Elena’s blood). With this sort of thing, normal science dictates that Hayley’s body would attack the baby in the womb, because it sees it as a foreign object. (This happens to some women whose blood type is too different from their baby, and it rejects the embryo. It’s painful. They have to take mountains of medication just to have a chance of stopping a miscarriage.)
• A baby’s blood is not transferred into the mother? So how the hell is Hayley ingesting healing vampire blood anyway? The nutrients are passed from the mother into the baby, not the other way around.
• Even if the baby was a werewolf/vampire hybrid, this wouldn’t work because the only reason Klaus was able to be turned into a vampire was because his werewolf side had not yet been triggered by a kill, and he was turned by magic. If the baby is already part vampire, then it wouldn’t be able to age, therefore it wouldn’t be able to grow in the womb, it also wouldn’t be able to kill someone (aside from maybe Hayley), so the werewolf side wouldn’t be triggered, either. So many contradictions. Also when Klaus was turned into a vampire he—you betcha—ingested some of Tatia’s blood (the doppelgänger!). The baby has not ingested any doppelgänger blood, so how could it even be a hybrid in the first place?
  

And this is why Julie should have never touched a baby plot with a ten foot pole. There are so many issues with the logic of such a story. 

I actually feel kind of sorry for the people who are swallowing this. It doesn’t reflect well on their intelligence.