Signs of autism in children: what parents should know
If you have questions about your child's development, you're not alone. Many parents notice differences in how their child communicates, plays, or responds to the world around them. This page shares information about developmental signs that are sometimes associated with autism — and explains when it may be helpful to speak with a professional. It is not a diagnostic tool, and no online resource can replace an individualized evaluation.
Every child develops differently
Development varies widely from child to child. Some children reach milestones earlier or later than average without any underlying concern. The signs described here are not proof that a child has autism — they are patterns that professionals look for as part of a comprehensive evaluation. If you notice several of these patterns consistently, it may be worth discussing with your child's pediatrician or a qualified specialist.
Communication differences
Some children who are later diagnosed with autism show differences in how they communicate. These may include limited babbling or cooing in infancy, not pointing or waving by 12 months, limited use of words by 16 months, not combining two words by 24 months, or losing language skills they previously had. Some children communicate in ways that are different from typical development — for example, repeating phrases from videos or books rather than using original language.
Social interaction differences
Children develop social skills at different rates. Some signs that professionals look for include limited eye contact, not responding to their name by 12 months, limited interest in other children, difficulty understanding social cues, or preferring to play alone rather than with others. These patterns are not definitive — many children go through phases of preferring solitary play or being slow to warm up socially.
Repetitive behaviors and routines
Some children show strong preferences for routines, repetitive movements (such as hand-flapping or rocking), or intense focus on specific topics or objects. These behaviors exist on a spectrum and are not automatically a sign of autism. Many children without autism also engage in repetitive play or have strong preferences. The concern arises when these patterns are persistent, intense, and interfere with daily life or learning.
Sensory sensitivities
Children who are later diagnosed with autism sometimes show unusual responses to sensory input — being very sensitive to sounds, textures, lights, or tastes, or seeking out intense sensory experiences. Sensory differences are also common in children without autism and can be addressed through occupational therapy regardless of diagnosis.
When it may be helpful to speak with a professional
If you have consistent concerns about your child's development — in communication, social interaction, behavior, or sensory responses — it is always appropriate to speak with your child's pediatrician or request a developmental evaluation. Early evaluation does not mean early labeling. It means getting information that can help your family understand your child's needs and access support if it would be helpful. You do not need a diagnosis to begin therapy services.
Frequently asked questions
Last reviewed: September 2026. This page is for informational purposes only and does not constitute medical advice or a diagnosis.
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