Autism spectrum disorder (ASD) is a neurodevelopmental disorder that is diagnosed in children at three years of age. Although in most cases symptoms may be present before the three years of age if identified and diagnosed earlier, it can help to manage effectively. 

If we talk about symptomology ASD covers three major areas of symptoms that is,

Delay or absence of speech and communication,

Lack of age-appropriate socialization and

Repetitive and ritualistic behaviors.

Along with these major symptoms associated symptoms may include, inappropriate play, absence of pretend play, solitary play, difficulties in interpersonal relationships, difficulty in adaptation to changes in environment, and sensory issues i.e. under regulation or over regulations of five senses. Anxiety, Adhd, OCD, and ODD can also be comorbid with ASD in some cases. 

Assessment of Autism spectrum Disorder requires careful observation by a professional and it includes history taking, sessions with the child, and the use of various standardized psychometric scales such as ADOS which is mostly used nowadays for diagnostic purposes. 

Early assessment and identification of symptoms help to manage the symptoms better. Early intervention is key for a better outcome. It not only helps in managing symptoms and helps the child perform better but also prevents further damage and worsening of symptoms. Applied Behavior Analysis, Speech therapy, occupational therapy, play therapy, and social skills training, are the therapies implemented based on individual needs, to help the child better adjust to his environment. Although the developmental disorder can not be cured but with the help of proper therapies and support these conditions can be successfully managed.

Parents,m should be vigilant and if they see any signs of ASD in their kid they must immediately seek professional help.