Finding friends!

Ok I know this sounds stupid, but I'm actually a little worried about this. I'll be leaving my job in March when baby gets here to be a stay at home mom and though there will be a ton of things to do around the house and caring for my new baby, how did anyone meet friends?! I'm not close with my neighbors, my family lives 30+ minutes away, and though I'm not particularly social, it would be nice to have a mom or two to go have a girls night with that understands. I'm at the point in life (29) where half my friends are either married with kids way older (6-10), or single and have no children. No one I know already is at the stage of having been married for two years and just now starting their family. How did you guys meet friends?!