I am an only child.
Not through choice, my parents lost two children before me, I was born by c-sec, mother then divorced and married again, and had another child who died before he reached his first birthday.
So, everyone I've spoken to expects me to say I was spoiled, that as the only child out of four, I was probably treated like a princess.
Nothing can be further from the truth. I was resented from the day my brother died.
I learned to create my own entertainment and am quite happy when I'm alone.
Anything I ever did, academically, physically, arty, whatever, was never good enough for mother and she ruled my life in small doses for a long time.
She made sure I was always held back and would have a dig at me every time I spoke.
I was a married mother myself before I finally managed to cut the ties. As a result I have not spoken to her for 12 years.
Do I think she'd have been any different if my brother had survived? Who knows.
Personally, I don't think it's anyone else's business if you have one child, two children, three, or 16. What's important is the child is brought up well and happy.