Financially, you are responsible for ALL children you father whether or not the Moms work. I’m not really understanding your question. It sounds as if since your current wife is not working, and you have a child under 3 with her, then you should not have to support that child as well as the child your Ex-wife has (and is not working). One doesn’t cancel the other out. You still support your current family as well as the child from marriage #1. They’re still your kids.
I keep seeing this situation all the time on this site. It’s a double-edge sword for lack of a better term. A couple has a child, the Mom stays home to care for the child…never goes back to work–or never worked in the first place. Sometimes the Dad stays home. Some families CHOOSE this in the best interest of the children and some do not. Eitherway, IF THE MARRIAGE FAILS, then the man(or woman) is set to burden a huge financial obligation child support-wise and alimony wise. Some folks use that to their advantage-some do not. Some pull their bootstraps up and decide to fend for themselves and they get a job, only asking for the other parent to support the kids. Is it fair to the Dad/Mom to have to pay so much? Is it fair to the Mom/Dad to have to give up caring for her kids at home? There is no right answer. There is no ideal solution. [V] [|)] [:0]