Your child's birth month may make him or her more likely to be diagnosed with Attention Deficit Hyperactivity Disorder (ADHD) according to a new report recently published in the "Canadian Medical Association Journal."

How much more likely?

According to this study, children with December birthdays are 39% more likely to be diagnosed with ADHD, and 48% more likely to be given prescription medication for it.

The age requirements for children entering Kindergarten vary by location; kids in Michigan are allowed to to begin school at age 4, so long as they turn 5 by December 1st. Canada's requirements are different, therefore the study focused on children born in December, because they're likely to be the youngest in the class. In Michigan, children with November birthdays are typically the youngest.

This video from the CBC says experts now believe children who have difficulties sitting still or concentrating may be more likely to be cast as ADHD, but the problem may actually stem from being too young or immature.