If he would disagree, he would be absolutely wrong, though? Your child is owed support from their father, morally if not legally (I don’t know where you live, but I don’t think there are many countries where he wouldn’t be required to provide for his child.) If he doesn’t want to be in their life, financial support is the bare minimum he can do. He played a 50% role in creating a human being, he doesn’t get to just walk away from the situation.