Common psychiatric disorders in children include mental retardation, specific developmental disorders, pervasive developmental disorders, and hyperkinetic disorders. Mental retardation is a neurodevelopmental disorder characterized by below average intellectual functioning and deficits in adaptive behaviors. It has various causes including genetic conditions, infections, trauma, and socioeconomic deprivation. Children with mental retardation may exhibit delays in motor skills, speech, self-care abilities, and cognitive skills. Specific developmental disorders affect a single area like reading, math, communication, or motor skills. Pervasive developmental disorders include autism spectrum disorder which involves impairments in social skills and communication from early childhood.