Remember the worst-case rumors that the baby might be an alien? these fics the baby's other parent isn't human.

Dream a Little Dream by Babos
The Dissident Hybrid Mother by Anna X
Five Twinkies, an Alien Baby, and Chris Carter by mysterygirl1
Gwen series by Tracey H.
The Gump Files by Noelle L
Having My Alien Baby by Alelou's Evil Twin
Her Sacrifice by Jude De la Reds
Jeremy by Teall 1
Jordon series by Pamela O
Junior by Poet
Lamb by LostInOblivion
The Mettle of Honor by N. Y. Smith
Miracle Season by Neoxphile (Fowley's sons)
MoonShine by Janis
Mulder's Other Baby by Neoxphile
Mulder's Son by jrfpatton
Seventh Day by Amatia
Shoulders by Missy J
Smothered Joy by Luperkal
The Taking Series by Jenn Chiprich
Three Men and a Baby (Alien!) by David O.
Unknown Lives by Donna

Didn't find exactly what you're looking for? We could always use more new additions. Consider penning a fic for our related challenge :)

The Nursery Files