MAN1B1-CDG is a form of congenital disorders of N-linked glycosylation characterized by intellectual disability, delayed motor development, hypotonia and truncal obesity. Additional features include slight facial dysmorphism (hypertelorism, downslanting palpebral fissures, large, low-set ears, hypoplastic nasolabial fold, thin upper lip), hypermobility of the joints and skin laxity. The disease is caused by mutations in the gene MAN1B1 (9q34.3). The disease is MAN1B1-congenital disorder of glycosylation (Monarch Disease Ontology id MONDO_0018349). Also known as: MAN1B1-CDG, carbohydrate deficient glycoprotein syndrome type II due to MAN1B1 deficiency, congenital disorder of glycosylation type 2 due to MAN1B1 deficiency, congenital disorder of glycosylation type II due to MAN1B1 deficiency, intellectual disability-truncal obesity syndrome.