In 8 to 10 months child start speaking simple words like mama, Dada and also starts imitating sounds. By 24 months vocabulary is increased by 30 to fifty words and child starts forming combinations like go there, my room etc. By the age of four child form and respond to complex sentences. Autism spectrum is a group of development disorder, prime symptoms are difficulty in communication and interacting with people and environment. Repetitive actions. ADHD is a childhood disorder symptoms are inability to pay attention, hard to stay still hypersensitivity. Difficulty in controlling behavior. Symptoms can be controlled by medication and behavioral therapy. But there is no known cure yet.