And the big kids are those born at the start of the academic year. Children born in June, July, August are about 50% less chance of making the grade.This. What I will say is I see lots of great wee players playing 5/7/8 aside up until u13s I think it is. They then go onto 11 a side competitive football and the players and coaches in my opinion tend to revert back to get the biggest lads in and kick everything that moves. A lot of kids then lose interest and are pretty much lost to the game.