So my baby momma wants to try fixing things

[insane]

I think you need to ask yourself "What is my ultimate goal" If your goal is for your child to have mommy and daddy and have a normal childhood and everything works out than you are putting a lot of power in her hands. If your goal is to be the best father you can possibly be and to always love and support your child, while being a positive influence in their life, then <super long sentence i know> you can do that without getting back with her. I guess you could casually date her and see if its working out but without giving her any guarantees and you know test the waters. I am just fearful only based on what you say here that you can go overboard for your ex and fall into her trap and be stuck in a bad situation.
I might sound or act like a dick on this forum but when it comes to real life stuff like this I do care about the well being of the people on this forum. Anyone who is a friend of Stephan's is also a friend of mine.
Good luck!