To be honest,

I don't think your hu*****and can reduce the amount to be paid for his child unless you can show extreme hardship to your children, which, based on the facts you described, won't happen.

What you are facing is nothing more than someone wants to have more children but feels the financial pressure of doing so.

When I get married, I probably would like to have at least 4 children, but I don't think I can afford that. So what will I do? Have two children at most.

Your hu*****and's first child is his blood. I understand you respect that, but I don't think you respect that enough.

Back to your question, I don't think you have a chance. In addition, brinig the issue up will put pressure on your hu*****and, which may not be good for your marriage.

The results of your situation will be very simple. You live with your decisions. You live with your budget.