Very little is known about what causes autism. The EARLI Study will help us understand why some children develop autism. It will identify possible causes, which could be genetic, environmental, or a combination of both. It is the largest study of its kind, involving families with greater risk for having a child with autism and collecting extensive information over several years. Other research shows that signs of autism can be seen as early as 12 months of age, so the EARLI Study will focus on exposures and events that occur during pregnancy and early childhood. To participate, families must live within two hours of the Sacramento Valley or the San Francisco Bay Area. For contact information, download a flyer here.