Jesy Nelson is today launching a petition with Parliament demanding all babies are checked for spinal muscular atrophy as she backs the Mirror campaign. The former Little Mix singer’s twins have the devastating muscle wasting disease and have been told they will never walk - but a £5 blood test at birth would have prevented this. Jesy, 34, is today joining forces with the Mirror and charity SMA UK to demand a blood test for SMA to be added to the NHS heel prick test given to all newborns. She