Early Identification of Autism: Early Characteristics, Onset of Symptoms, and Diagnostic Stability

Area of Science:

• Developmental neuroscience
• Pediatric psychology
• Clinical audiology

Background:

• Infants later diagnosed with autistic spectrum disorders (ASD) may show subtle early disruptions.
• These disruptions in social interest, attention, communication, and growth precede clinical symptoms.
• Early developmental trajectories can influence the child's environmental interactions and symptom development.

Purpose of the Study:

• To review current knowledge on early signs of ASD in infancy (0-12 months) and toddlerhood (12-36 months).
• To highlight the importance of considering variability in ASD onset and progression.
• To discuss implications for early intervention and monitoring.

Main Methods:

• Literature review of studies on early ASD indicators.
• Analysis of developmental trajectories in infants and toddlers at risk for ASD.
• Synthesis of findings on diagnostic reliability and symptom stability.

Main Results:

• Subtle disruptions in social, communication, and growth parameters are observable in the first year of life.
• Developmental precursors allow reliable diagnosis by age 2, with stability by age 3.
• Variability in onset and trajectory necessitates tailored approaches.

Conclusions:

• Early identification of ASD risk factors in infancy is critical.
• Interventions for infants require careful design based on emerging research.
• Early monitoring and age-appropriate interventions are essential for supporting children with ASD.