Tay-Sachs disease
Tay-Sachs disease is a very rare and usually fatal genetic disorder that causes progressive damage to the nervous system.
In the most common form of Tay-Sachs disease, a baby will develop normally until they are around three to six months old.
Tay-Sachs disease is caused by a genetic mutation called the HEXA mutation.
Tests can be carried out to check if you are a carrier of Tay-Sachs disease or to diagnose the condition after birth.
There is currently no cure for Tay-Sachs disease, so the aim of treatment is to make living with the condition as comfortable as possible.