Amyotonia Apr 2026

Infants with amyotonia often appear limp, have difficulty holding their heads up, and may show a "frog-leg" posture when lying on their backs.

Amyotonia is characterized by "floppy" muscles that lack the normal tension required for movement and posture. amyotonia

Most cases historically labeled as "amyotonia congenita" are now recognized as Spinal Muscular Atrophy Type 1 (Werdnig-Hoffmann disease). 2. Common Causes Infants with amyotonia often appear limp, have difficulty

, historically often referred to as amyotonia congenita , is a medical term used to describe a profound lack of muscle tone (hypotonia) present from birth. While once used as a specific diagnosis, it is now considered a clinical symptom associated with several neuromuscular disorders, most notably Spinal Muscular Atrophy (SMA) . Infants with amyotonia often appear limp