MONDO_0014784 (severe hypotonia-psychomotor developmental delay-strabismus-cardiac septal defect syndrome) is a rare, genetic, non-dystrophic congenital myopathy disorder characterized by a neonatal-onset of severe generalized hypotonia associated with mild psychomotor delay, congenital strabismus with abducens nerve palsy, and atrial and/or ventricular septal defects. Cryptorchidism is commonly reported in male patients and muscle biopsy typically reveals increased variability in muscle fiber size. Also known as: IHPMR, hypotonia, infantile, with psychomotor retardation.