My girl is G6PD & she attended full day nursery since she was 2.5 yrs old. No need to worry, nowadays G6PD is very common and most schools are aware of this (perhaps much better understanding than us). My girl's nursery issues notice to remind parents to get rid of the bad smell of uniforms when changing the summer/winter uniforms due to the effect on G6PD kids. So, just tell the school that your kid is G6PD is fine.