I have one DD, she's 5. I'll be honest, we have ttc#2 for 3 years with no joy and we are coming to terms with being a family of 3. I was sad for a while, but these days, I can see lots of advantages.
DD had a friend round to play last week, they bickered a little over who was wearing which princess dress, who was having the pink bowl, who had more in their drink. I had a headache by the time she went home and appreciated the peace and calm we have in our little household.
DD has a lovely life. We please ourselves, and she gets loads of time with me and her dad to do homework, craft, bake, play games.
Plus, I'm tired. I'm 35 and the thought of all those sleepless nights again, ugh. And - I was rubbish at pregnancy, it was grim and I felt like crap for 9 months. So, yes, one child rocks, nothing selfish about it at all!