Written by Michelle Castillo, (CBS News)-- Not much is known about what causes autism spectrum disorders (ASD). Now, one Norwegian study suggests that women who take folic acid supplements may be less likely to have a child with the developmental disorder .

Autism and ASDs are pervasive developmental disorders marked by varying degrees of social impairment, communication problems and repetitive and stereotyped behaviors. Children may make little to no eye contact, react differently when they are in stressful situations or are angry, may not respond to verbal attempts to get their attention. In addition, those with the disorder may be fixated on a subject and have been known to be interested in numbers, symbols or science topics.

© 2013 CBS Interactive Inc. All Rights Reserved.

Read or Share this story: http://on.wusa9.com/1lFs9nS