Do people believe their personal anecdotes and experiences negate all the statistical research??
YOUR summer born by be brilliant, but statistically they do less academically well on a number of measures.
20% less well than their cohort is very statistically significant, but of course still means 80% will do as well, or better.
But 20% suggest some underlying disadvantage, as obviously children born in august are not less bright then those born in September, and a systemic disadvantage needs to seriously considered.
A system such as the Scottish one where children born after Feb can either start that September, or delay for a year if they need it developmentally, and some do some don't, as this thread shows, often it the boys who need more time, would go a long way to addressing this unbuilt disadvantage in the system.
FWIW, I have two averagely academic summer borns, (where are all they average children on MN ??? There don't seem to be any, and they are the majority!!!), who I think would have benefitted academically and socially from starting school a year later.
I'd have opted for this if there had been some choice and flexibility within the system to take into account discrepancies in development of young children.