Interesting question this and the different answers are even more interesting! I'm one of quite a large family and I remember it as being overcrowded, no personal space, no chance of ever having anything that was "just mine" and really very poor financially. I made the conscious decision to only have 1 child and, interestingly, so did every one of my siblings. Have I ever wondered if we should maybe have had more? Never. We made sure that the house was always full of other children for DC to play with, we took his friends and cousins away on holidays with us, as they did with our DC. Being a singleton doesn't have to mean isolation and loneliness, it just means that, as parents of an only child, we had to put more effort into it. So, I wonder if most people's own childhood, and the pros and cons of that, determine our decisions as to the number of children we then choose to have ourselves?