A tenth of pre-school children have a serious psychiatric illness, yet most cases are missed, say experts. Professor Adrian Angold from Duke Medical Centre found that 10% of the children in his study had obvious signs and symptoms of psychiatric illnesses such as attention deficit hyperactivity disorder (ADHD), anxiety or depression, which is similar to the rate seen in older children. He believes that doctors should screen for and treat these disorders in babies and infants, because waiting until childhood or adulthood is too late. For example, if someone has depression it can be harder to treat if they have had it for a long time with lots of relapses.

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