This week an important study was released that provides information that parents can use – particularly parents with a child with autism and another on the way or who is an infant.  This of course comes from the Baby Siblings Research Consortium and makes particular observations about families with 2 or more affected children vs 1 affected child.  They have different rates of autism outcomes and trajectories of behaviors that parents and doctors should be aware of.  In addition a new meta analysis of vitamin supplementation shows that while moderate doses of vitamins may not be harmful, they may not also be helpful.  In other words, talk to your doctor about a nutritional plan and assessment, and save your money for things that are known to work.
https://www.ncbi.nlm.nih.gov/pubmed/31589284
https://www.ncbi.nlm.nih.gov/pubmed/31586029