In Belgium, to counteract the relative age effect, they run a second group of youth internationals made up of players born later in the year. Yannick Carrasco is said to be one of the beneficiaries of this system.
This.
"In 2009, professional English youth academies (aged 16-20 years) were grossly over-represented by players with birthdates in a three month period. 57% of youngsters were born in September, November or December whilst only 14% celebrated their birthday in June, July or August."...