Hello,
I’m not sure of all the details of your history with the baby’s daddy, but if you feel in your heart that you want your baby to know him, then it is probably the right thing to do. You would be following your heart. I think honestly, anytime a mother involves the father, married or not, in the life of his child, it will only produce good things. For the baby, she/he will have an opportunity to form a bond with daddy. For the father, experiencing the innocence of his child in his life will only have a good effect on him and he may begin to rethink the importance of life and his priorities.
I will caution you though, if you feel that you or the baby are at risk of being in danger by offering the father a visit, then you should NOT arrange for one unless it can be supervised by your parents, or a court authority. (depending on your circumstances) Do not put your baby or yourself in a situation where you cannot get assistance should the visit go bad.
I hope this has helped, but please let us know if there’s anything else we can do.
Best wishes,
myangelsinheaven