At what age are children commonly diagnosed with mental retardation?

At what age are children commonly diagnosed with mental retardation?

Charles Sophy (Private Practice in Adult, Child and Adolescent Psychiatry) gives expert video advice on: What are the possible causes of mental retardation?; What is the treatment and prognosis for a mentally retarded child? and more...

The ages mental retardation are typically diagnosed are within the 3-5 year age range, because that's when children are developing the most. You will start to see the lack of developmental milestones of walking, talking, or toilet training, or the loss of those in children with mental retardation in this age range. But typically, mental retardation is diagnosed within that range.