So long as you are designated on the minor child's birth certificate as her father where for all intents and purposes you are not the biological father you would be under the laws of all states in this country responsible for child support for this child. The only exception would be that you go through a process of DNA and blood testing showing that you are not the father of the child and that the other man is the biological father of this child.In retrospect, contesting paternity for this minor could cause a lot of harm to her in the long run by you.