After he had been in hospital for four days, the doctors, who were still waiting for the results from Great Ormond Street, said Connor was stable enough to be discharged. Weeping, Jo handed him over to her sister-in-law, a lawyer, who lived nearby. "She doesn't have any children and she had no idea how to look after a baby," says Jo. "I gave her long lists of instructions, his cot, bottles, baby monitor. I made sure he had his favourite green blanket and dummy." Jo's eldest son, Sam, suffers from attention-deficit hyperactivity disorder - diagnosed a month before Connor's birth - and because this makes him boisterous, Jo couldn't help wondering if he could have hurt his younger brother. "It did go through my mind," she says. "But I had always been careful not to leave Connor alone with Sam."