Ankle cramps are an early manifestation of spasmodic paraplegia. The condition is severe and requires brain and spinal cord MRI and genetic testing to determine the illness and receive symptomatic treatment. Since the baby’s nervous system is not fully developed, normal physiological nervous system manifestations may occur, such as nystagmus and increased knee reflexes in the first few months after birth, as well as occasional ankle cramps. As the child grows older, these symptoms will gradually improve.