You can’t force the other mother to work.
I have been reading your posts and I agree with the other posters in that you need to just let the past go. You and your husband are working now. The courts will see that you’re making effort to repay the arrears. I suppose Unemployment wasn’t an option while he was out from being fired?
It sounds like you and your husband have just experienced a rough patch in your life together, and you’ve made it through and are getting back on your feet. If your husband makes an effort (with back-up evidence) in repaying his obligation, then I don’t see how any court would jail him. Your post sounds like he was in arrears for several months before the warrant was issued. Surely he was served with some paperwork or notice of arrears. Bottom line is it happened and you can’t change it, you can only try to fix it and move on.
Life may not seem fair. But it’s those times we are tested that make us stronger IF we approach it as a learning experience…not one filled with bitterness, anger and “how come SHE doesn’t have to” or “how come I have to…”, easier said than done-I know. BUT you are wasting precious time and adding undo stress by worrying about the ex. Concentrate on you, your husband and your child and it WILL get better.