Children who are developing typically will show a recognizable pattern of social engagement, communication, and play that builds steadily from infancy through toddlerhood. If your child makes eye contact, shares emotions with you, uses gestures to communicate, and plays with toys in imaginative ways, those are strong signs of typical development. No single behavior rules autism in or out, but understanding what “on track” looks like at each stage can help you feel confident about where your child stands.
Social Smiling and Eye Contact in the First Year
The earliest signs of typical social development appear in the first few months of life. By about eight weeks, most babies begin producing real social smiles: intentional, responsive reactions to faces and voices rather than the reflexive smiles seen in newborns. A baby who lights up when you lean in, who tracks your face, and who seems genuinely interested in looking at you is showing healthy social wiring.
Joint attention, the ability to share focus on something with another person, develops earlier than many parents realize. Research tracking infants found that 44% were already making joint attention bids by six months, looking between an object and a caregiver’s face as if to say “are you seeing this?” By nine months, every infant in the study had done this at least once. If your baby shifts their gaze between a toy and your face, or vocalizes while looking at you to draw your attention to something, that’s joint attention in action.
Communication Milestones by Age Two
Language development is one of the first things parents notice, but the milestones that matter most for ruling out autism aren’t just about how many words your child says. They’re about how your child uses communication socially.
By 18 to 24 months, typically developing children hit several key markers identified by the CDC:
- Gestures beyond waving: blowing kisses, nodding yes, shaking their head no
- Two-word combinations: phrases like “more milk” or “daddy go”
- Pointing on request: when you ask “where is the bear?” in a book, they can point to it
- Identifying body parts: pointing to at least two body parts when asked
- Social referencing: looking at your face to figure out how to react in an unfamiliar situation
- Emotional awareness: pausing or looking sad when someone else is crying
That last one is especially telling. A two-year-old who notices another child is upset and reacts, even briefly, is demonstrating social awareness that develops naturally in neurotypical children.
How Typical Communication Differs From Autism
One of the most important distinctions isn’t whether a child talks, but why they communicate. Typically developing children use language and gestures for social reasons: to share excitement, to comment on what they see, to start a back-and-forth exchange. A child with autism more often uses words to control their environment, like demanding a snack or protesting a change, without the same drive to share experiences socially.
The difference shows up even before children have words. A typically developing toddler who can’t yet say much will compensate with symbolic gestures: pointing at a dog to share their excitement, holding up a toy to show you, waving at a neighbor. Children with autism tend not to use these compensating gestures. Instead, they might physically push your hand toward what they want or lead you by the wrist to an object. The underlying issue isn’t an inability to communicate. It’s a reduced drive to communicate for purely social purposes.
So if your child is a late talker but still points at airplanes, brings you toys to look at, and checks your face for reactions, that pattern looks much more like an isolated speech delay than autism.
Play Behavior as a Window Into Development
The way children play changes predictably as they grow, and the progression itself is reassuring when it follows the expected path. Between 2 and 10 months, babies engage in exploratory play: picking up objects, mouthing them, banging them, shaking them. This repetitive, sensory-driven play is completely normal at that age.
Between 12 and 18 months, functional and pretend play starts to emerge. This is when a child picks up a toy phone and holds it to their ear, pretends to feed a stuffed animal, or pushes a toy car along the floor while making engine sounds. By 18 months, most children are directing pretend actions toward dolls or other people, not just themselves. A child who stirs a pot and then offers you a taste is showing you something important: they understand that objects represent other things, and they want to include you in the game.
Children with autism often stay in the exploratory phase longer, preferring to spin wheels, line up objects, or focus on one sensory property of a toy rather than using it imaginatively. The key distinction isn’t that a toddler sometimes lines up blocks (many typically developing kids do this). It’s whether imaginative, social play is also present alongside those behaviors.
Sensory Sensitivities Alone Don’t Mean Autism
Many parents worry when their child covers their ears at loud sounds, refuses certain food textures, or gets distressed by clothing tags. Sensory sensitivities are common in childhood and exist on a wide spectrum. They are part of the diagnostic criteria for autism, but only when they co-occur with social communication difficulties.
Children with autism may show three distinct sensory patterns: under-responding to input (not reacting to their name being called or to pain), over-responding to input (extreme distress from sounds, textures, or lights), and sensory seeking (repetitive behaviors like spinning, rocking, or fixating on visual patterns). A child who dislikes loud noises but otherwise engages socially, communicates with gestures and words, and plays imaginatively is showing a sensory preference, not necessarily a sign of autism. The social piece is what separates the two.
What Formal Screening Looks Like
All children should be screened specifically for autism at their 18-month and 24-month well-child visits. The most widely used tool is the M-CHAT-R, a parent questionnaire that takes a few minutes to complete. It asks about behaviors like whether your child points at things, responds to their name, and shows interest in other children.
Scores fall into three risk categories. A total score of 0 to 2 places a child in the low-risk range, which accounts for about 93% of children screened. Children in this range don’t need further evaluation unless other concerns come up later. Higher scores trigger a follow-up interview to clarify the results before any referral is made.
A low score on the M-CHAT-R combined with the social behaviors described above, consistent eye contact, shared enjoyment, gestures, and emerging pretend play, is a strong indication that your child is developing typically. Development isn’t perfectly linear, and children hit milestones at slightly different times. What matters most is the overall trajectory: a child who is increasingly social, increasingly communicative, and increasingly imaginative in their play is moving in the right direction.