Muscular hypotonia (abnormally low muscle tone) manifesting in the neonatal period and affecting the entire musculature. The phenotype is HP_0008935 (Generalized neonatal hypotonia). Also known as: Generalised low muscle tone in neonate, Generalised neonatal hypotonia, Generalized low muscle tone in neonate, Hypotonia, neonatal, generalised, Hypotonia, neonatal, generalized.