Five weeks after birth, a trio of WES was performed and a de novo heterozygous variant in the GRIN1 gene (c.1824G>C; p.Trp608Cys) associated with neurodevelopmental disorder with an autosomal dominant inheritance pattern with or without hyperkinetic movements and seizures (MIM#614254) was identified. The gene discussed is GRIN1; the disease is neurodevelopmental disorder.