lwb...I did my legal separation by myself...I went to the court house and found the Family Court facility...I attended orientation, got the paper work, filled it out, returned and had one of the attorneys look it over to make sure it was all done correctly...then I filed it with the court...I also applied and got a financial waiver so I didn't have to pay for filing...This is in CA I am not sure about your state...
NoDirection...first, for DB'ing to work you need patience and to realize that time is your friend...sometimes a long time...secondly it is okay to keep track of her coming and going but just so you know in CA unless she is openly having sexual relations with OM in front of your son or doing illegal drugs or otherwise injuring your son physically it doesn't much matter what she does...my brother went through this and basically the judge told him that just because his wife chose to have sex with an OM, move out, get pregnant and then married, refuse to potty train or break the bottle habit with his son that was almost 4 yrs old...didn' make her an unfit mother...the best you can hope for is 50/50 but don't count on that as they will usually give the mother more time...even if she is morally weaker then the husband...sad but the way it is in "no fault" states...
The good news in all of this is I don't see your case as hopeless...I think your wife is having a quarter life crisis...she had a baby not long ago...is struggling emotionally with her own feelings...so there you have one mixed up woman...the good news is given time (that word again) she could very well come to her senses and return to what she knows and loves...her family...but you can't make her do that anymore then she can make you wait for her...it is up to you what you do and where you go from here...just be sure...be sure you have tried it all...and that you can look her in the eye with peace...if not, your not ready!