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The diagnosis of Autism Spectrum Disorder (ASD) is carried out through clinical observation and the application of scales and monitoring instruments. This study aimed to evaluate the diagnostic profile of ASD in childhood and adolescence in Brazil. A cross-sectional, exploratory, retrospective, and quantitative study was conducted based on partial results of the MAPA Autism Brazil 2025. The study universe comprised 1,329 individuals; 76.07% were children. The mean age of diagnosis was 5 years, median 3 years. Only 23.7% of diagnoses were made in the public health system. At diagnosis, 66.37% were between 0–4 years, 22.2% between 5–9 years, and 7.83% between 10–14 years. The diagnostic hypothesis was suggested by families in 57.94%, health professionals in 25.58%, educators in 14.9%, and self-reported by autistic individuals in 1.05%. Manifestations leading to diagnosis included communication disability (79.68%), restricted interests (63.28%), stereotypies (61.4%), limited reciprocity (59.67%), self- or hetero-destructive behaviors (29.5%), feeding selectivity (4.36%), and sensory sensitivity (1.35%). In conclusion, ASD diagnosis is influenced by family, school, and society, and must be made early to ensure proper therapies are implemented.