Been lurking for a while and, as the mum of one lovely DD, I feel sad reading threads where people are worried about their child being an only. This article might offer some reassurance. It's written in response to some know-all child-rearing "expert" from Australia who has apparently been criticising small families.
www.dailymail.co.uk/femail/article-1066316/Small-families-breed-pampered-children-What-utter-nonsens e.html