I think you’ll find that they dont show the episodes in chronological order. Not that it matters.
The thing is, I agree that she is irritating. There was just no need to slag her weight. Especially as your knowledge of pregnancy and weight gain is well of the mark.
It is great that your parter/wife didn’t gain weight , but that doesnt mean that that is the norm. My partner lost weight during the earlier stages of her pregnancy as she ate even healthier than she normally does. She was still abit puffy around the face though.
You ever thought of engaging your brain before you speak?