I normally stay clear of these threads as they make me so ragey. Thank goodness for Tony's clear albeit drunken post 
Honestly, nobody said August children can't do well. I mean, I was born in August and you know, did ok in my exams but I realise that's not the same as proper research. Gosh, I'm sure I've said that already.
The fact that some of us worry about our August born children to me suggests we are pretty involved parents who care about their education.
My eldest is definitely catching up but he is yr4 now and he is in a very good school with small classes and luckily quite a few summer born children.
But I think you are being a little silly if you don't perhaps realise that being born in the summer is a disadvantage in the early years of education. The lack of social and emotional maturity in a just 4 year old boy compared to a just turned 5 year old is a lot and I'm very surprised some people don't see that.
However, the research about them then doing well at university (if they go) is encouraging.
And now I'm going to talk anecdotes. I have noticed that those people who've had to encounter some difficulties in their early lifes often become more successful adults, perhaps because not everything has always been easy and they're used to working hard/struggling.