R.G.
K.,
Something you may want to consider is, of course if it suits your tastes, switch to a good beer with some color. An amber or a dark would be ideal. And limit yourself to one. Beer is made from hops which is excellent in helping to encourage milk producton and with the level of alcohol from one beer you would eliminate the need to pump and dump. And just think, you'll actually be doing yourself some good with the beer.
Now if you're NOT like me and actually have a good supply of pumped milk on hand, then pumping at all unless it's necessary within about 2 hours of drinking that ONE drink isn't really required.
Even if you do decide to have the wine instead of the beer, just remember that just like how your BAC level is affected, one drink for every hour, 2 hours of no pumping or pump and dump is appropriate for each drink. If you can limit yourself to one wine or one beer, you'll be fine.
Have fun. I was never able to do what you're going to attempt with such a young little one. I couldn't make it out the door without them.
Enjoy!