Can I be held responsible for paying support when another man signed the child’s birth certificate?

You are responsible for paying child support if you are a legal father. You need to have your case reviewed by an expert on paternity law. You need to find out if another man and the mother signed a voluntary declaration of paternity when the child was born. If the mother was married and the age of the child is also important. The facts regarding your relationship to the child also need to be evaluated.