Kilquist syndrome (MONDO_0033664, a Monarch Disease Ontology id) is an autosomal recessive multisystem disorder characterized by neurologic, gastrointestinal, and secretory dysfunction. Affected individuals present at birth with hypotonia, feeding difficulties, mild dysmorphic features, and sensorineural hearing loss. They show poor overall growth associated with gastrointestinal anomalies such as gastroesophageal reflux or midgut malrotation, as well as profound global developmental delay with inability to sit or speak. Tear, sweat, and saliva production is also impaired, causing dry mouth and recurrent bronchial mucus plugging. Some of the clinical features are reminiscent of cystic fibrosis. Also known as: KILQS, SLC12A2-related autosomal recessive neonatal-developmental delay-intellectual disability-feeding difficulty-sensorineural deafness syndrome.