MARTHA BELLISLE 12/30/2021 12:05pm EST SEATTLE (AP) — The omicron-fueled surge that is sending COVID-19 cases rocketing in the U.S. is putting children in the hospital in close to record numbers, and experts lament that most of the youngsters are not vaccinated. “It’s just so heartbreaking,” said Dr. Paul Offit, an infectious-disease expert at Children’s...