Kate looks like she is still carrying. I am not being rude, just an observation. (Don’t hit me I am not married).
Some women are like that. I know some women who have had only one child and look like that, and several others who have had seven or eight children and look like that. And then there are others who walk out of the hospital looking as if the pregnancy had never occurred, even after multiple pregnancies.
If the baby was large, and he was, it may be a few weeks before Kate gets “back to normal,” but if she is otherwise healthy, she may begin working on certain exercises to help with the bulge. Believe it or not, but nursing helps to reduce the size of the post-natal uterus.
It’s OK to be curious about things like that.
*hug*
This is perfectly normal, although very annoying to new mothers. (Not as bad as being asked if you're having quintuplets.) It takes a few weeks for the uterus to shrink to the original size, and then the abdominal muscles have to contract.
She had a big baby for such a thin woman, but she's obviously very disciplined and will get herself back into her desired shape.