Big WTF moment? In the Child, when Deanna gets impregnated by that alien life form. It's not that part that bothers me. Hey, it's sci-fi. Anything can happen. But in the briefing when Picard tells the senior staff, he says, "Counselor Troi is pregnant. She's going to have a baby." Nobody reacts until he says "She's going to have a baby." Look, I'm no doctor, but even I know what "Pregnant" means. These folks are Starfleet's finest. They have at least the equivalent of a Bachelor's Degree. Some were scientists. I really don't think they'd have to be explained the word "Pregnant."