I'm going to offer another perspective here as a married couple with no kids. We don't like kids and don't want kids. However, we are very happy for our friends that have kids. This year it seems like ALL of our married friends are having kids. We're happy for them, we really are, but EVERY single time we talk to them, the conversation always falls back to their child. They forward us pictures of their kids and start talking baby baby baby.
It was our choice to create distance with these friends. Like I said, great that you have kids but we don't want to hear about them every other second. And some of friends really have changed since having kids. I understand kids are life changing and you might have another view about life now (like one friend who perceives everything as dangerous now).
I'm not against being friends with couples with kids, I just really limit my time with them because too often, their lives revolve around their kids which there is nothing wrong with, but it's not for either of us. And like I said, we prefer not to be around children. That's just us.