Anyone choose to have just one child?

DH and I always talked about having two kids. Since we were older when we started, we planned to start the adoption process over again when our first child turned one. Peanut will be one in three weeks! We talked today, and both of us feel that we're happy with one child. We told our attorney, who occasionally gets calls about baby born situations, and another friend who, through her work, occasionally knows about baby born situations as well, to keep us in mind (we'd talked with them both a few months ago.) today we decided that we're not going to go through an agency or actively seek out a situation, but if one comes to us we'll consider at that time what is right for our family. I was just wondering if anyone else chose to have just one child, and if so, do you regret it?