A mother of a autistic child plays games with two autistic boys in a rehabilitation center in Harbin city, Northeast China's Heilongjiang provine on April 2, 2013. Autism is a neural development disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Early behavioral or cognitive intervention can help autistic children take care of themselves, and gain social and communication skills. April 2 is World Autism Awareness Day.[Photo/Xinhua]

A child suffering from autism looks outward on a balcony of classroom in a rehabilitation center in Harbin city, Northeast China's Heilongjiang provine on March 28, 2013. Autism is a neural development disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Early behavioral or cognitive intervention can help autistic children take care of themselves, and gain social and communication skills. April 2 is World Autism Awareness Day.[Photo/Xinhua]