This lawsuit is not about the amount he has to pay, this is about the welfare of the child conceived in this situation. Since she let it be born, she then subjects her life to the reality that the courts are often honor bound to look out for the best interests of the child, now that it is deemed a person by the court system of this land.
The best solution (based on the facts reported in the story) would seem to be granting custody to the boy’s parents, if they are found to be fit.