A recent Canadian study showed that the youngest children in each grade (born in the earliest month of the Canadian grade cutoff: December) were 30% more likely to be diagnosed with ADHD than the oldest children (born in January). For girls, who overall have a lower incidence of ADHD, the difference was even more pronounced: 70%.

Interestingly, the overall rate of ADHD diagnosis in the sampling of children from this Canadian study (900,000 children) was 6.9% for boys and 2.2% for girls. Rates of diagnosis here in the United States are much higher, creeping up on 10% of all children.

via The conundrum between maturity and ADHD.

Medications are not without their side effects…