Thanks for your insightful and sensitive comments on this thread, they have actually helped me to work through a few things in my own head. And also for sharing your own experiences.
I would say re. other mums, it's been a case of people I met at the same time my son was a baby losing interest and not really wanting to bother with us as they have gone on to have second and in some cases, third, babies. As a another poster said, it's like we're not really "in the club" any more. Some of it may be because they are understandably very busy but I distinctly have a feeling of being less socially desirable.
There have also been a few throwaway comments from other mums and friends that have been a bit... Off.
One good friend had a baby recently in a very chaotic and precarious situation that is partly of her own making. I have not been judgemental and have done my best to show up with kind words, nice baby gifts etc, especially since the dad is no longer in the picture.
Ds and I went across town to visit her recently, and over coffee she asked me outright what I was going to do to ensure that I didn't raise my son to be a spoiled brat, because the other only children she had known growing up had all been absolutely awful. She then went on to say that her WORST fear for her baby daughter was that she would be an only child. I almost spat out my coffee.
I am pretty certain my beautiful and otherwise very smart friend will find another guy in due course who may well also treat her terribly just like the previous one did, and she will have another baby.
Now, according to some people, maybe her way is the "correct" one. No doubt many people reading this will consider her more of a mum than me.
Refusing to have an only child is the hill she will die on.
For me, not raising a child in a chaotic environment is the hill I will die on. Things were not in a good way at all in my family unit in that short window for me to have a second child. Not good at all. I made a choice to protect the family I already have.
I think a lot of people on this thread don't understand what that feels like, but I hope there are some people reading this who will gain some insights into the kind of decisions mums of onlies sometimes have to make.
See also - I know of a woman who had a horrific time with IVF to get her first and only son. She could have gone into debt and risked her health to do IVF again to give him a sibling but took a pragmatic decision not to in order to protect the family she already had. Again, some people might think she is less "committed" to motherhood whereas I think the exact opposite.