My wife suspects that my drinking is over, she keeps asking tonight after I got home if we need to "talk" tomorrow.
If my wife ever wanted to "talk" with me after I came home drunk I would know I'm screwed.
I have many years of experience as a father and I'm a rather astute observer of people. Prepare yourself.
In this situation, a wife may very well say, stop drinking now, or the baby and I are leaving. The maternal instinct is a powerful thing, and a woman may well think that the safety and well-being of her baby, are more important then being married to a drunk. Often, with the birth of a child, the husband suddenly finds himself in second place when it comes to a woman's priorities.
Since you haven't been able to quit the past few months with what you are currently doing, maybe it's time for something radical like an AA meeting. Taking action like that (instead of just talking about how you are going to quit) may be the "good faith" effort your wife needs to see.
Good Luck!