The most reliable early signs of autism in toddlers include: not making eye contact, not responding to their name by 12 months, not pointing to show interest by 14 months, not using two-word phrases by 24 months, and loss of previously acquired language or social skills at any age. No single sign is diagnostic — the pattern across multiple domains and the child's overall developmental trajectory is what matters. If you're seeing several of these signs, an Early Intervention evaluation is the right next step.
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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Find a Provider →Harmony Care Finder Editorial develops general educational guides to help families navigate provider searches, coverage questions, and care planning. Articles are not medical, clinical, or therapeutic advice.
Editorial information. A named clinical reviewer has not been assigned to this article. This guide provides general educational information and is not medical, clinical, insurance, or therapeutic advice.