He's in preschool, I take it? It's such an amazing age, as far as watching them grow and learn. Be proud, and continue to be proud. Learning is something our kids love to do, it's instinct, until someone squashes it. Don't let anyone ever squash it.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).