I think its a personal thing and it really does depend on the personality of your child. There is no way my daughter could be an only child and "enjoy" it. Whereas my gf's daughter loves being an only child, loves playing by herself and has a great old time. Mind you her father was an only child and loved it too. Whereas I was an only child and hated it. I found it very lonely. I don't think any mother is selfish or wrong to only want one child, and if you do have a child that likes to socialise then you just compensate for that in other ways Its never ever that black and white, I too agree with the hold off and see approach...

Goodluck!

*hugs*
Cailin