Photo by Annie Spratt on Unsplash During the first month of life, newborns do not know that a world beyond themselves exists. As children grow, so do their interactions with the world. But in some instances, a child’s ability to interact with the environment and people stays limited. This severe behavioral problem is known as autism. In some cases, children may be developing normally, reaching milestones, and then regress, reportedly often after a routine vaccine or exposure to another toxin.