Intellectual developmental disorder with autism and macrocephaly (IDDAM, OMIM #615032), also referred to as CHD8‐related neurodevelopmental disorder with overgrowth (CHD8‐NDD), is a condition with autosomal dominant inheritance characterized primarily by intellectual impairment, autism spectrum disorder (ASD), and macrocephaly (Douzgou et al. 2019; Mitchel et al. 2022; Ostrowski et al. 2019). The gene discussed is CHD8; the disease is Cognitive impairment.