Of course I must say straight off that I love dd2 to bits and wouldn't send her back for anything!
And I know am VERY lucky to have two children - this is not a 'feel sorry for me' thread.
HOWEVER I had always wanted just one child and after I had my beloved dd1 I could see no reason to have another. I was so happy to have her in my life. One reason I wasn't keen to have another is that I couldn't imagine having more room in me to love another an equal amount.
Well 7 years on I had dd2. And she is wonderful. But if I am REALLY honest i will always have a special place in my heart for dd1 and will always wonder what life might have been like if we'd stayed with just 1 child.
So good luck to all you 1 child families - I know you'll be very happy.