talking about your kids, if you have kids, is just the same as talking about any other part of your life. Why is it different to talking about your job, or your partner, or your parents, or your hobbies? No one only talks with their friends about the things they have completely on common. I don't have pets but I'll talk to my friends about their pets. I don't ski, but I'll talk to them about their skiing holidays. That's just what you do in a friendship. You talk about the different things that are important to you.
Maebe that sums up friendship perfectly.
I wonder if others have noticed a recent media trend in pitting mothers against non-mothers (always the women, never men). Growing up, my parents had friends from all walks of life, some had children and some didn't and it was never an issue; now, however, we seem actively encouraged to forge an identity through reproductive choices and "stick with our own". It seems I am bombarded with media articles and blogs about "what I secretly hate about my childless friend"/"what I really want to say to my childed friend" or advice on how to "maintain" these friendships which does little more that continue to emphasise the differences in lifestyles.
For what it is worth, I understand where the OP is coming from on the "mummy friends" thing. I swear my SiL took delight in dumping all her friends when she became pregnant because "now I am with people who truly understand me" and for her, the idea of not talking about one of the children for more than 30 seconds would be unthinkable - why have children if you want to discuss other things/people???
I think there is a middle ground, which most sane people manage to acheive
. We need friends from all walks of life - some who have known us for a long time and really understand our personalities, some who ahve gone through shared experiences, some who can cheer us up with a joke...
I don't have children and would probably fit into the "largely by choice" category, although I am very comfortable with my ultimate decision (I'm also a committed auntie, godmother and work with teenagers). Would I get fed up if a friend spoke about nothing other than a blow-by-blow account of what her child did and said over the past month? Of course I would. Would I get fed up if a friend similarly dominated the conversation with what her cat did or a minute-by-minute reconstruction of her latest travels? Absolutely! But all these topics are things that I would expect to hear about and would take an interest (sometimes more genuine that others) because that's what friends do.
What does make it difficult however is when one person is outnumbered in a group and no matter how much everyone things they are moderating their conversation to include everyone, there really are a lot of references to their children and little comments like "well, you wouldn't understand; you're not a mother" or seemingly positive comments like "ooh, your life is so different from ours" which, as they stack up over an evening can start to sting. Obviously the same can happen in the opposite situation when a mother is out with a group of childfree friends but I'm focussing on the situation presented in the OP.
Perhaps the OP's friend does actually need a friend. Maybe talking about her work is a way of trying to get the OP to ask the right questions so that she can confide that she is unhappy or has concerns about the future. Maybe she is genuinely scared of losing her friends so her demands to not hear about any children is her way of trying to turn back the clock and recreate the way your friendship/nights out used to be. I'll admit I got very scared and maybe a little crazy at the thought of losing friends (yes, this did come from the aforementioned media articles) Or maybe she is just being selfish, which is a trait not confined to the childfree or parents.
As others have said, she obviously thinks you are close enough to set embargos without it causing a problem so do the same back to her. Tell her you will be happy not to speak about your child if she agrees to hold back on conversation on one topic also.