You've noticed something different about your child's development. Maybe they're not making eye contact the way other kids do, or their play seems repetitive, or they're not responding to their name consistently. You're scared to google it, but you're also scared not to. Here's what you need to know about the early signs of autism, what they mean, and why early identification matters so much.
What autism is (and isn't)
Autism Spectrum Disorder (ASD) is a neurodevelopmental condition characterized by differences in two core areas: social communication and restricted or repetitive patterns of behavior or interests. It's a spectrum — meaning it looks different in every person. Some autistic children speak fluently; others are nonverbal. Some have significant support needs; others are highly independent. It's not caused by vaccines, parenting style, or screen time. It's neurological, present from birth, and lifelong.
Early signs by age
By 6-12 months
Limited or no eye contact during feeding or play. Doesn't respond to their name being called. Doesn't smile back when you smile at them (social smile). Limited babbling or vocal back-and-forth. Doesn't reach to be picked up or show anticipation of being lifted. Less interest in watching faces than in looking at objects.
By 12-18 months
No pointing — specifically, no pointing to share interest ("look at that dog!"), though they might point to request things. Not using gestures like waving or showing objects. No single words by 16 months. Doesn't bring things to show you. Limited imitation of actions or sounds. Doesn't follow your gaze when you look at something. Loss of previously acquired skills — any regression in language or social skills at any age is a significant red flag.
By 18-24 months
No two-word phrases by 24 months. Limited pretend play (doesn't feed a doll, talk on a toy phone, or pretend to cook). Lines up toys or objects repeatedly rather than playing with them functionally. Intense interest in specific objects or parts of objects (wheels, fans, lights). Unusual reactions to sensory input — distress at certain sounds, textures, or lights, or conversely, seeming not to notice pain. Difficulty with changes in routine. Repetitive movements like hand flapping, spinning, or rocking.
Signs that are commonly missed
In girls: Autism in girls often presents differently. Girls are more likely to mask — copying social behaviors from peers, developing scripted social interactions, and appearing to engage typically on the surface. They may have intense friendships with one or two children rather than broad social difficulty. They're also more likely to have restricted interests that are considered "normal" for girls (horses, dolls, drawing) — the intensity of the interest is what's different, not the topic. Girls are diagnosed an average of 1.5 years later than boys because of these masking behaviors.
In highly verbal children: A child with a large vocabulary can still be autistic. They may speak in advanced, adult-like phrases but struggle with back-and-forth conversation, use scripts from books or shows, or have difficulty adjusting their communication style to different social contexts.
Why early identification matters
Early intervention for autism — starting before age 3 — is associated with significant improvements in language, social skills, and adaptive behavior. The brain is at its most plastic (changeable) in the first few years of life, making therapy during this window especially effective. Children who receive early, intensive intervention often show gains that persist into school age and beyond.
This is why "wait and see" is outdated advice. If you have concerns, pursue evaluation now. You don't need a diagnosis to start services, and early intervention is free through your state's program for children under 3.
Next steps if you're concerned
Talk to your pediatrician. Ask specifically about developmental screening and autism screening (the M-CHAT-R is commonly used at 18 and 24 months). Contact Early Intervention. If your child is under 3, call your state's Early Intervention program directly. You don't need a referral. Request a comprehensive evaluation from a developmental pediatrician or psychologist. Waitlists can be long, so get on one early while pursuing other services in the meantime. Start speech and occupational therapy if recommended — these can begin before a formal diagnosis.
A diagnosis isn't a limitation. It's a map. It helps you understand how your child experiences the world so you can support them effectively. And an autistic child who is understood, supported, and accepted can thrive in ways that will surprise and inspire you.