Which category of disorders typically manifests in early childhood and results in deficits or excesses in specific behaviors?

Neuro developmental Disorders

A common feature of the neurodevelopmental disorders is that they manifest in the early stage of development. Often the symptoms appear before the child enters school or during the early stage of schooling. These disorders result in hampering personal, social, academic and occupational functioning. These get characterised as deficits or excesses in a particular behaviour or delays in achieving a particular age-appropriate behaviour. Several disorders like Attention-Deficit/Hyperactivity Disorder (ADHD), Autism Spectrum Disorder, Intellectual Disability, and Specific Learning Disorder are examples of  neurodevelopmental disorders. These disorders, if not attended, can lead to more serious and chronic disorders as the child moves into adulthood.