BD since you are truly at a point where you would be fine with a divorce, then go ahead and file. I don't remember reading fears you have with being a single mom and raising your baby...that was one of my hang ups!
Just please report to us still after you give him the papers. Do you know how many times I wished I had gone through with the D in March 09? Time went on and my hope grew and then I didn't want S to be without a dad, then I felt like our marriage was interrupted but had hope for it still and thought WH might be temporary insane and figured he would have ended it with OW. All these thoughts made me hesitate and not want the D. But a clean break would have made this a lot easier. So if you want to, go ahead!
I am thinking other things but I won't say them at this time.
me,34 exH,34 S,16 months S:3/31/09-left for OW started DBing 10/09 d final: sometime 10/10 current: http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2022856&page=1 met in 2004