Alien supersoldiers continue to be a problem as Scully prepares to give birth.
Tropes used in this episode:
Adult Fear: Giving birth in the middle of nowhere because indestructible super-beings are out to take and/or kill your child. And just when you thought you were safe, they gather while you're in labor.
Away in a Manger: William's birth has multiple parallels to the Christ birth story. This includes the proverbial Star of Bethlehem (which leads Mulder to the abandoned town where Scully gave birth) and the Three Wise Men as portrayed by the Lone Gunmen. An interesting birth, given that Mulder is a agnostic and Scully a Catholic—the symbolism probably wasn't missed by either of them.
Screaming Birth: Scully, though at least half of her screams are directed at the Super Soldiers standing outside.
Sealed with a Kiss: The very last scene of the episode, following an equally heartwarming scene of Mulder and Scully admiring William.
Three-Month-Old Newborn: Averted. Jerry Shiban (son of producer John Shiban) played baby William, and was only a couple weeks old at the time of filming. Kim Manners, in the DVD commentary for this episode, laughed at the situation of having to re-cast William for season 9. Apparently, all babies don't look alike and having to find one that looked like Jerry was not as easy as it sounded.