Doctors said I might not make my second birthday with muscle disease SMA. Now I'm 25BBCSinger Jessy Nelson revealed this week that her twin daughters have been diagnosed with Spinal Muscular Atrophy (SMA) type one, a muscle-weakening disease. The former Little Mix star is now campaigning for all babies to be tested for SMA at birth, a crucial time when irreversible damage to the nervous system can be prevented. BBC journalist Ben Morris has SMA and describes what it is like to live with the condition. Life started with a bit of a bump for my parents when they noticed that I, aged about six months, wasn't developing at the same rate as my other newborn friends. Other babies my age were kicking and crawling, but I was quite content sitting in my buggy, watching the world pass me by. Worried something wasn't quite right my parents took me to the GP.