Developmental delays tend to affect children primarily between the ages of 3 and 5. This is the stage when children are learning and perfecting their skills, including language, motor, social, emotional, and cognitive. Early diagnosis and treatment of developmental delays can help children catch up with other children their age.

The Child Development Assessment Scale was first applied in 1967 and until 2004. The National Children's Hospital has researched and standardized the DENVER II test to suit children in Vietnam. So what is the DENVER II test and how is the test performed?

Mental retardation is not a disease but a developmental defect of the brain. Children often have limited daily living skills, as well as lower intelligence quotient than normal people.