These four events repeat every 'tropical' year (365 days, 5 hours, 49 minutes), so they become later by about six hours, or (if there has been an intervening leap day) earlier by about 18 hours, from one year to the next.
The three distinctive signs and symptoms of autism include problems with verbal and nonverbal communication, difficulties with social interaction, and repetitive behaviors or narrow, obsessive interests. There are three distinctive symptoms of autism.
But children with autism spectrum disorder usually show some signs of delayed development within the first year. If you suspect that your child may have ASD, discuss your concerns with your doctor. The symptoms associated with ASD can also be linked with other developmental disorders.