I just find it hard to believe that that applies universally across countries and cultures and hemispheres and school systems and everything. But maybe I just don't want to believe it because it means I already screwed everything up for my September-born kid! Doomed from birth, poor thing!

I was definitely one of those parents desperate to get my kids to school as soon as possible! But one has a September birthday and is the youngest in his year, and I know that other parents, in a different position (I've, who could afford private childcare) held back their kids with September birthdays because of this idea they would be more likely to get college sports scholarships or do better or whatever. Not being from the US and having gone to uni with people from other countries (who start school at different times and ages), i have always thought this is really weird -- like surely, and compared to kids from other nations with different school systems, surely this can't still be giving intentionally-held-back kids an edge once they are older?

That's crazy! I could totally see that happening some places here too though.

I often wonder about this - how birth month might affect academic or sporting performance. Someone must have done this research to some extent, surely? I'm from the UK, had kids in Mexico (where school year cutoff was December at least in our district) and now live in US, where it's October, but where so many parents try to game the system by holding their kids back that some districts are really strict on age/school start dates. It's fascinating.