Autism spectrum disorder (ASD) is now more widely recognised in both the public and medical spheres. Developmental impairment known as autism spectrum disorder (ASD) is brought on by variations in the brain. Individuals with ASD may struggle with confined or repetitive activities or interests, as well as social communication and engagement. Moreover, people with ASD may learn, move, or pay attention in various ways. Due to the increased number of children and teenagers seeking earlier guidance, evaluation, and diagnosis, there is a strong need for services. All clinicians working with children, including primary care teams, allied healthcare professionals, educational and social care staff, must have a solid understanding of the presentation and assessment of autism spectrum disorders (ASD) and an understanding of the co-morbidities to maximise detection and minimise harm. There are standards in the identification, referral, and diagnosis of autism, even if entry points for referrals can change due to a variety of presentation and local service provision. In order to improve a child's potential, provide appropriate support, and implement focused interventions for ASD and co-occurring problems with the hope of improving outcomes, early identification is advantageous. This case study discusses autism spectrum disorder (ASD) diagnosis and offers professionals who come across a child with suspected ASD an assessment strategy.