Are you making your toddler an over-achiever? Beware! According to a new study the increasing academic stress on younger children is likely to be the reason behind the high prevalence of attention-deficit disorder. Researchers from the University of Miami in the US hypothesized that increased academic standards since the 1970s have contributed to the rise in diagnosis of attention-deficit hyperactivity disorder (ADHD). From time spent studying to enrolment rates in pre-primary programmes everything had increased and not surprisingly in the past 40 years also saw ADHD diagnoses double the study revealed. Read: Children with ADHD have bad memory even as