Of the 6 of us in our antenatal group I have stayed in touch with three other women. Our children have grown up from the newborn baby phase through to pre school age together.
I've sometimes found it challenging to get along ok with these friends. We have the stereotypical 'friends because of the children' arrangement.
I have a small number of very close friends who I would do anything for and have nothing in common with in terms of lifestyle (for e.g. most of them not married/partnered or have children) but our friendships work, because we just click, and our circumstances don't come into it, if that makes sense?
Anyway, cut to the chase. These friends I made when I was pregnant with my first. They are OK but increasingly I am finding it harder and harder to socialise with them. It's impossible to move them away from talking about our children to any other topic. And I mean any other topic - from the situation in Libya, the economy through to the X Factor and Strictly Come Dancing, they will not entertain talking about anything that isn't child related.
On top of that (and more of an issue for me) is an undercurrent of competitiveness around the chuildren. I guess it was like this when they were babies and I turned a blind eye but I've noticed that the others seem to still see things that our three year olds do as a competition. For example, who is dry at night - who is 'accomplished' at this, and who is not. The children are three
Everything is a 'milestone' or a competition or a brag. I have a few other friends with similar aged children who I get on far better with, and I notice that we NEVER talk about 'milestones'. In fact, we rarely talk about our children at all as we have other things to chat about 
Anyway, very longwinded, I'm sorry. But DD is close to the children of these friends, but I find that spending time with them leads to an unpleasant taste. The dry at night thing is just an example, there is/has been competition over everything. I can give more examples if required, I don't mean to dripfeed but this post is long enough already.
Anyway - AIBU to cut off contact with these people, even though DD enjoys seeing their children? DD started pre school in Sept and is loving it and already has made lots of friends and been to birthday parties etc. I'm just wondering if now might be the time to make a break for it?