The Sooner the Better

Therapy is important, but so is diet. Please, if you think your child is showing signs of autism, consider a whole foods approach to feeding them. Ruthlessly cut out anything artificial (and consider a gluten free casein free diet). It's harder to undo damage from toxic food exposures than it is to avoid them in the first place. Teach your child that food should look like something grown from the ground, not something out of a toy box.

The author of thie article would do well to look at the work around autism done by the Gordon Research Institute, where they do have some idea of the various conditions increasing susceptibility of young children to autism, including various insults to the immune system.