Scotland has become the first part of the UK to test newborn babies for Spinal Muscular Atrophy (SMA). The rare genetic condition causes progressive muscle weakness and, without treatment, can limit life expectancy to just two years. The condition was recently highlighted by singer Jesy Nelson, formerly of Little Mix, whose twin baby daughters have been diagnosed with SMA. Babies can be identified as having SMA through a heel prick test and early treatment can prolong their lives. As part of a two-year pilot, this test will now be given to all babies born in Scotland. The test has come too late for Grayce Pearson, now three, from Milton, Glasgow, who was diagnosed with SMA type 2 when she was a baby. She lacks a protein vital for muscle development which affects everything from walking to swallowing and breathing. Her father Tony said: "Overnight she stopped kicking her legs and wasn't attempting to crawl.…