(Original Publication Date, 21 September 1990)
Panel 1: Liz interrupts Mike's sulking about having to be teased by four irrelevances to talk about how great having a new baby is. He dunno about that because of a rather obvious reason.
Panel 2: She can't wait to see what happens and wonders if the new baby will be a girl. Mike surprises (just) her by hoping it's a girl too.
Panel 3: Remembering that Mike has spent the most of her life cowering behind the fact that she herself is a girl as an excuse to avoid admitting that he's a noxious little piece of crap that hates sharing because he's not fit to live, she asks for confirmation and gets it.
Panel 4: We set up next week's arc by having the sullen creephead say if it's a girl, he won't have to share his room.
Summary: This, I think, is why Liz spends the rest of her life being irrationally jealous of April: Mike ruined things being his own worthless self. Said self is a godless moron who doesn't want to admit that feelings he can't feel are real because it subtracts from him somehow.