A mother has won a six-year battle to get ACC to accept that medical error probably caused severe brain damage to her son. Penny Larkin's son Kurtis, starved of oxygen, was born dead at Hutt Hospital, and had to be resuscitated. Now aged 19, Kurtis weighs just 25 kilograms. He repeatedly suffers seizures. He cannot see, talk, walk, eat or go to the toilet by himself. "Mentally, he is a baby in a…