Your child support obligation continues while you are incarcerated.  Considering that you are incarcerated, not much more can be done to you while you are not paying.  However, once you are released, you will need to make arrangements to catch-up on back child support obligations.  If an enforcement action is filed, then most judges will simply add an extra $10-100 per month payment in addition to your regular payment until the arrearages are paid off.