The development of children born with<unk>  is normal for the first 8–18 months, but will then flounder and start to regress both physically and mentally. Motor skills and speech are lost, and optic atrophy causes blindness. A variety of neurological symptoms, such as epilepsy and myoclonic seizures, appear. The senses of hearing and touch remain unaffected. The average lifespan of an<unk>  child is 9–11 years.
Infantile neuronal ceroid lipofuscinosis
Mitochondrial encephalomyopathy
Neuronal ceroid lipofuscinosis
Familial encephalopathy with neuroserpin inclusion bodies
Batten disease
Mitochondrial neurogastrointestinal encephalopathy syndrome
Keshan disease
GM1 gangliosidoses