Parent-mediated Developmental Behavioral Intervention

Inclusion Criteria: * Child's age between 30-84 months old. * Children have a diagnosis of autism spectrum disorder or multiple developmental delays. * Children without physical disabilities or major health problems, such as congenital limb defects. * One of the fathers or mothers involved in the study shall be the primary caregiver of the child. * The father or mother participating in the study has at least 9 education years and can read and understand Chinese. * The father or mother participating in the study is willing to allow the child to undergo a comprehensive development assessment and is willing to video during the training process. Exclusion Criteria: * Absence of chromosome abnormalities, congenital anomalies, and major neurological or sensory impairments or disorders (e.g., cerebral palsy, microcephalus, macrocephalus, severe brain damage, uncorrected vision, or hearing loss).