"Fly? Oh, of course, fly," the Doctor said. "Yes, fly. Very nice. Has it got wings yet? Do you know if it's a boy or a girl?"

Ultrasounds of an angelic baby. Wow, that must have surprised the doctor. How did angels get pregnant, anyway? Weren't they supposed to be pure? Weren't they supposed to be male?

Hmm. Maybe that was why you never heard about pregnant angels; the Lord had taken precautions...