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Although you may recognize some telltale signs of ASD in your toddler, ultimately you need the professional discernment of a doctor or other qualified individual. Your doctor may choose to recommend tests to more thoroughly examine relevant potentially telling aspects of your toddler's cognitive development. If you suspect your toddler is showing signs of ASD, tell your doctor. Try to have relevant information on hand such as if your child:  Doesn't respond to social interaction with a smile of happy emotional expression by 6 months of age. Doesn't mimic facial expressions or facial movements (such as sticking out your tongue and your toddler doing the same), or sounds, by 9 months of age. Is not babbling or making cooing sounds by 12 months of age. Isn't making gestures such as pointing, by 14 months of age. Has not uttered single words by 16 months of age or pairs of words by 24 months of age. Doesn't engage in imaginary play by 18 months of age. Seems to be regressing in their social or verbal skills. There are individuals who may specialize is diagnosing and/or treating ASD, such as child psychologists, pediatric neurologists, or developmental pediatricians. Keep in mind there is no single medical test to diagnose ASD, so try to remain patient as you and your doctor work through the diagnosis process. There is no "cure" for autism, but therapies can help your child gain skills and be more comfortable. The aim of these treatments is to maximize your child's ability to function day to day through gaining coping mechanisms and focusing on learning outcomes. Some treatment options include:  Behavior and communication therapy in which the aim is either to reduce problematic behaviors and communication styles, or to improve these areas by teaching new skills. Family therapies in which the emphasis is on teaching the toddler's family different ways to interact with the toddler to promote their social and emotional development. Sensory integration therapies and a sensory diet, to improve your child's tolerance to sensory input and manage hyperactivity. Educational therapies that are highly structured individually tailored programs executed by a team of specialists who have expertise in communicating with and teaching individuals with ASD. Medications such as antidepressants or antipsychotics can be somewhat effective in controlling symptoms such as anxiety and severe behavioral problems, respectively.
Recognize you need a doctor to officially diagnose. Express your concern to your doctor. Realize you may be referred to a specialist. Recognize that autism is lifelong, but your child can receive support.