Sara England was putting together Ghostbusters costumes for Halloween when she noticed her baby wasn’t doing well. Her 3-month-old son, Amari Vaca, had undergone open-heart surgery two months before, so she called his cardiologist, who recommended getting him checked out. England assigned Amari’s grandparents to trick-or-treat duty with his three older siblings and headed to the local emergency room. Once England and the baby arrived at Natividad Medical Center in Salinas, California, she said, doctors could see Amari was struggling to breathe and told her that he needed specialized care immed…