ARID1B pathogenic variants are associated with several clinical features, including intellectual disability, developmental delay, severe speech delay, corpus callosum abnormalities, etc. The ARID1B variant was classified as an incidental finding in case 6428, because most of the clinical features associated with neurodevelopmental disorders are difficult to observe on prenatal ultrasound. The gene discussed is ARID1B; the disease is Delayed speech and language development.