Mulder: He's done this to other women here, Scully, just like in Czechoslovakia. My guess is that baby we just dug up belonged to one of Wayne's other wives.
Scully: What are you saying, that he's trying to propagate? He's trying to breed?
Mulder: He's exercising his biological imperative and he'll do anything or say anything he has to to succeed.
Scully: But it doesn't make sense, Mulder. If he's trying to breed then why would he be snatching his own babies and burying them in his backyard?
Mulder: Because they're demons and he wants a normal child.