He can file for a modification if he is now supporting another child as well.
Attorney Inga Stevens is licensed in Maine. She provides general information on Avvo.com. No attorney-client relationship arises out of the information given here.
Of course, the flip side is the mother can file for an increase in support based on inflation, changed circumstances, etc.
This post is for information purposes only and does not constitute legal advice, nor does it establish an attorney client relationship with Mr. Cassara.