Signs of Autism in Toddlers: A Parent Checklist This checklist is a reference tool, not a diagnostic instrument. No single behavior on this list confirms autism. What matters is a pattern of behaviors, how consistent they are across settings, and whether they depart from your child's own baseline or from typical milestones. If several signs are present, that is a reason to raise concerns with your pediatrician, not to wait. For how these signs appear at different ages, how they differ from typic
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