Autism, a developmental disorder, cannot be detected with a medical test. But as a parent, you spend every second with you child and thus, can spot the early signs of autism before anyone. Our expert Ms. Surabhi Verma, director, Sparsh for Children, a multidisciplinary therapy center for intellectually weak children, Delhi, tells you about some early markers or symptoms that can be helpful in the diagnosis of autism. By 6 months: No big smiles or other warm, joyful expressions. By 9 months: No back-and-forth sharing of sounds, smiles, or other facial expressions. Might laugh or giggle on their own (without any reason).