He will have to file a paternity action and establish that he is the father
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The prior answer is correct in that the father must establish that he is the father, assuming you were not married to him. This would likely require retaining an attorney to assist him. Best of luck to him.
This information is provided as a public service to provide a general answer and should not be relied upon as legal advice.
Since you and the father were not married, the father has no rights regarding the child and will have none unless an until he files an action to establish paternity and obtains an order confirming that he is the father. That court can also establish parental responsibility, timesharing and child support. What the outcome of all that will be will depend upon the facts of your case. I suggest you consult an attorney if the father files a paternity action or if you are considering filing such an action to establish child support. Good luck.
This answer is intend to provide general information on the topic raised by the question and should not be relied up as or considered to be legal advice. Before you take any action, you should retain and consult with an attorney to confirm what the appropriate course of action is in your particular case.