A rare, genetic neurodegenerative disorder characterized by severe, persistent hypotonia (presenting at birth or in early infancy), severe global developmental delay (with poor or absent speech, difficulty or inability to roll, sit or walk), profound intellectual disability, and failure to thrive. Additional manifestations include microcephaly, progressive peripheral spasticity, bilateral strabismus and nystagmus, constipation, and variable dysmorphic facial features (including plagiocephaly, broad forehead, small nose, low-set ears, micrognathia and open mouth with tented upper lip). The disease is hypotonia, infantile, with psychomotor retardation and characteristic facies (MONDO_0014176, a Monarch Disease Ontology entry). Also known as: IHPRF, IHPRF syndrome, hypotonia-speech impairment-severe cognitive delay syndrome, infantile hypotonia-psychomotor retardation-characteristic facies syndrome.