Hi Rajesh! Hand flapping is sometimes found in children who have Autism Spectrum Disorder but is very common in children without ASD as well. In particular, infants who are pre-verbal will flap their hands, twirl their wrists and feet and generally use their bodies to express excitement. You should not feel worried by hand flapping. Autism Spectrum Disorder is diagnosed based on multiple findings and not one isolated behavior. Children and adults with ASD have difficulty with social interactions and communication. Your pediatrician will follow your child’s development at each well child exam (your next one is at age 6 months) to ensure she is meeting all of her developmental milestones.