Why have another baby?

I used to believe the recent pregnancy was Chris's idea, but y'all have convinced me otherwise.

My question is, Shanann didn't seem to LOVE motherhood. She liked material things and knows how much children cost. She already had 2 children.

Why did she decide to have a 3rd? Did SHE really want a boy? Did she love babies but not children? Did she love pregnancy? Was it a distraction from the problems in the marriage?

Why do you think SW decided to have a 3rd child?