I'm sorry, did you say he has no leisure money? Oh boo hoo. No money for him to go gallivanting around town while his pregnant wife is at home raising two other kids? Um, no.
The options here are:
1. He either makes more money or you both cut back in some area to make it so you BOTH can have leisure money.
2. You go get a serving job or something and he FATHERS the children (father's don't babysit or "watch the kids"). The alternative to this is a babysitter but that defeats the purpose of you going out to bring home a paycheck, right?
I don't see other options, do you? Does he have a plan for when the baby comes?