The symptoms of autism generally begin to emerge in a person between 12 and 18 months of age. Oftentimes, babies develop normally until this age, but then they start regressing and lose skills. Now, a recent study suggests it may be possible to spot autism on an MRI scan months before symptoms start. 
Geraldine Dawson, a clinical psychologist and autism researcher at Duke University who was not involved in the new work, says:
“We’re learning that there are biological changes that occur at [the time] or before the symptoms start to emerge. It’s the ability to detect autism at its very earliest stages that’s going to allow us to intervene before the full syndrome is manifest.”
For the study, researchers conducted MRI scans on 150 children, 3 times: at 6 months old, 1 year, and 2 years. More than 100 of those children were at high risk for autism because they had an older sibling diagnosed with the disorder. Infants with older siblings who have autism have about a 1 in 5 chance of developing autism spectrum disorder (ASD).
The team found that 8 times out of 10, they could correctly predict which children would go on to develop autism based on the faster growth rate of the surface areas of their brains. They detail their findings in the journal Nature.  
Washington University child psychiatrist Dr. Kelly Botteron, explains:
“It was basically 80, 85% predictive of being able to basically make a diagnosis based on just their MRI scan changes from 6 to 12 to 24 months.” 
The study’s lead author, Heather Hazlett, a psychologist at the University of North Carolina’s Carolina Institute for Developmental Disabilities (CIDD), says that enlargement of the brain seemed to correlate with the onset of symptoms, but more research is needed. The study was small, and doctors shouldn’t start conducting MRIs on children in an effort to diagnose them. 
Still, if the findings can be recreated in a larger study, MRI could become a new diagnostic tool for high-risk children before their symptoms begin, giving parents the opportunity to start treating their child at a time when treatment will be possibly most effective. We just have to be careful with recommending such measures, or we could see issues similar to those arising from mammograms (causing issues due to being unnecessarily overused). Currently, the average age of diagnosis is about 4 years. 
“There’s pretty good evidence that the earlier we can make a diagnosis and begin interventions, even things like speech therapy, physical therapy, occupational therapy, kinds of behavioral interventions that we can have a much better long-term outcome.” 
Some of those interventions and treatments could include “hyper-parenting,” McPartland explains, meaning that a child headed for autism might benefit from more parental interaction such as cooing, singing, and laughing. He says:
“Supersaturate a child’s environment with social information as much as you can. And hope that it takes.” 
 USA Today
Julie Fidler is a freelance writer, legal blogger, and the author of Adventures in Holy Matrimony: For Better or the Absolute Worst. She lives in Pennsylvania with her husband and two ridiculously spoiled cats. She occasionally pontificates on her blog.