This sounds plausible as small differences in age can mean major differences among school age children. The effect isn't limited to academia either, a look at the birth dates of Premiership footballers, professional cricketers and rugby players reveals the same pattern:
The reason for the summer-birth disadvantage is that those children have to sit important exams up to 11 months earlier than their autumn or winter-born counterparts, the report by the Institute for Fiscal Studies (IFS) says.
It proposes a number of reforms to ensure that summer-born babies are no longer penalised because of an “unlucky birth draw”. Chief among these is the suggestion that all school test scores should be adapted to take account of students' birth month, right up to GCSE level.
An analysis of 348 Premiership footballers playing this season shows that 32pc were born between September and November while only 20pc were born between June and August.In other words being born at the wrong time of the year is a major disadvantage in all sorts of ways right through adulthood, and having to keep pace mentally and physically with older children is not always possible. Given the potential wasting of people's talents that the current system creates, it might be a good idea to consider using 6 month age groups for grouping children in schools rather than 1 year groups.
In cricket, 34pc of first-class players in the County Championship this summer were born at the start of the school year, compared with 18pc in the last three months.In rugby union's Guinness Premiership, 30pc of players this season were born between September and November compared with 18pc at the end of the school year.