Seems like it depends on the state .....I would suggest you DO NOT take out your rage on the child. It has no blame here. Place the blame on them not the kid.
This child deserves child support, and so does it's mother. Your decision to stay is questionable, and I can see that you are blaming her totally. Please, act mature, and you should divorce this man, as he must have done this before. He didnt even care enough about you to use a condom. So, stay and be a doormant (but I love you, honey, she was just a one night stand, she didnt mean a thing, blah blah blah. ) your terribly naive to belive him. Now there is a lifelong reminder of his cheating. Happy? Still wanna stand by him? Then you be supportive of the baby. Dont hate it.