DS was born on 1st Sept by ELCS. We were given the choice of the Friday before or the Monday (1st) which puts us in something of a pretty unusual position as we effectively had to make this decision before DS was born.
Both myself and DH are very bright - though DH suffers from severe dyslexia which was no picked up on until he was 16 which meant throughout school he had behavioural issues. Both of us are Summer Born ourselves but out performed the majority of our peers.
Which left us with an enormous dilemma.
We personally don't think that academic considerations are going to be his biggest hurdle given his background. If anything being the oldest in the year, we fear that academically he's more likely to get bored and act up than struggle with work.
But both of us to this day feel that we did suffer from being younger because of confidence and physical ability that didn't mean we didn't achieve our full potential. Emotionally I wasn't ready for things my friends were even at 18. I graduated when I was still 20 and looking back I feel I only really got the best out of university in my last year as I was simply too immature but wouldn't have benefitted from a year out for exactly the same reason.
We are now are stuck with the decision - which ultimately came down to us viewing confidence and maturity most important as well as him benefitting from a couple more days cooking time. I don't think its a decision you should have to make at either 0 or 3 (which is when you have to think about it, if you have a Summer born). You simply don't know how they will cope.
To my mind I think there needs to be greater flexibility for a movement of children up and down one year within each end of the spectrum based on the child's maturity and how they are coping. I know there is a school of thought that says this is bad for kids too, but I think its about how its done rather than the actual move that makes the difference. A small amount of mixed classes at primary level for example could really blur boundaries and help, without hindering the kids. My primary was small and had three years split into two classes which I do think benefitted everyone at that age.
I think the issue is not the cut off point but the rigidity of school years which aren't really as natural as boundaries. All 11 years olds are not the same and there is a massive difference in maturity and that's the problem that needs to be recognised rather than looking at when they were born too much.