Nice advice from Dogs and Shoes. (Thanks to Kate Harding for the link).
How to stay friends with people with kids when you don’t have kids
August 8, 2013 by blue milk
I realize that this approach probably involves changing your expectations so that you do not become resentful. Which is a process. But the approach is not without benefits. It is generally cheaper than other kinds of going out. You do not have to bother getting dressed up. You get to hang out in possibly cozy envrions. You get to keep your friendships. – See more at: http://www.dogsandshoes.com/2013/08/how-to-stay-friends-when-your-friends-have-kids.html#sthash.caVaz4jU.dpuf