The Australian Autism Handbook

Autism spectrum disorder (ASD) is a neurological (or brain-based) condition which affects child development in the first few years of life.

Autism spectrum disorder (ASD) is a neurological (or brain-based) condition which affects child development in the first few years of life. Core features of autism include difficulties in social communication and interaction, restricted interests, and repetitive behaviors. These characteristics exist on a spectrum, meaning they vary in severity and presentation from person to person. Autism affects approximately 1-2% of the population worldwide, with a higher prevalence in males. Key aspects of autism: Challenges in social reciprocity and non-verbal communication Restricted, repetitive patterns of behavior or interests Sensory sensitivities (hyper- or hypo-responsiveness) Difficulties in developing and maintaining relationships Varying levels of intellectual and language abilities

Studies of younger siblings of children with ASD – who have a higher likelihood of developing autism themselves – suggest that some children may display signs around, and even before, the age of 12 months. Red flags for autism in young children include lack of babbling, pointing, or other gestures by 12 months, no single words by 16 months, and no two-word phrases by 24 months. Other early signs may include: Limited eye contact and social smiling Reduced response to name Lack of imitation or pretend play Unusual sensory interests or aversions Repetitive movements or use of objects Early detection is crucial as it allows for timely intervention, which can significantly improve outcomes. Parents should trust their instincts and seek professional evaluation if they have concerns about their child's development.

The diagnostic evaluation may be conducted by: one health professional alone (either a paediatrician or child and adolescent psychiatrist or psychologist) or a team of health professionals (called a multidisciplinary team) who will decide together. Diagnostic process typically includes: Comprehensive developmental history Observation of the child's behavior Cognitive and language assessments Medical examinations to rule out other conditions Standardized tools such as the Autism Diagnostic Observation Schedule (ADOS) and the Autism Diagnostic Interview-Revised (ADI-R) are often used. The diagnosis is based on criteria outlined in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), which includes persistent deficits in social communication and interaction, and restricted, repetitive patterns of behavior, interests, or activities.

It's increasingly believed that the way we diagnose autism is biased towards males. Present methods aren't capturing all girls with autism, making the difference in rates between the sexes look greater than it actually is. Autism in girls often manifests differently from boys, leading to underdiagnosis or misdiagnosis. Girls may: Have better language and social imitation skills Show less obvious restricted interests Exhibit more subtle repetitive behaviors Be more adept at masking their difficulties (camouflaging) This "female autism phenotype" can make it challenging…