if you go via the legal system, there are 2 separate issues: first you can ask for child support and the court will force him to pay otherwise he will be put to jail. if you are sure HE is the father you will have to prove that he is the father, there are legal procedures for this as well, should he deny it. second, you do not have any right to prevent him seeing the kid UNLESS you can prove that this would be detrimental to the kid (he beats him, he talks bad to him, he shows immoral bevahiour etc.) at his turn he can go into the court and ask for a written order to allow him to see the kid. but, legally these two things are not connected, you can not blackmail saying 'show me the money or you will never see the kid'. he can simply sue you. or worse, you can be accused of blackmailing. we live in the 21st century, if he gets a good lawyer you could be in trouble should you choose this route