I'm one of 3 and I've always wanted 3. I have 2 boys (6 and 3) and I'm done.
I'll be honest, the minute I gave birth to DS2 I thought to myself "please don't let this be the last time I do this!" - I'm lucky to have breezy pregnancies for the most part, and lovely labors and delivery.
DH only wanted 2 but started to waiver when DS2 was 4 months. But I wasn't ready for a 3rd at that point and said to DH that if we were only going to have 2, I wanted time to process that in my own time.
38 was my cut off for having a 3rd and I just turned 38 in October. I am very happy we stuck with our 2 boys. As much as I have a fantasy of a third child, I don't feel anyone is "missing" - our sons are honestly the best of friends, they're good kids and more to the point, I can split myself equally between them and still have time for myself, my husband, my friends.
I also have my body back, my social life and all the interests I want to follow outside of my remit as "mum". And strangely enough, if I were to find myself pregnant now, my immediate reaction would be "oh fuck" rather than "yay". So that's my answer. We have money, we have a lovely home, we have holidays, we can give our boys a really good life.
I get wistful for the days with my newborns, when I first saw their perfect faces and the hours staring at their tiny little ears - but my God they're such great value at the ages they're at now, they really are and I realised the other day that there is no part of me that's broody.
I love babies, they're cute as all hell and in the past I would have held on to one for ages, entertaining an older baby etc. But now I'm happy to have a quick cuddle and hand it back to parents. I'm so pleased I'm at that point, because the yearning for a baby is a difficult thing to supress.