It was a terrifying situation for a Massachusetts mom.On Saturday, Siobhan Sherbovich was driving home from an ice cream shop. Her children were in the back seat, including her 8-year-old son, Brayden.”He just said, ‘Mom, I can’t breathe. I’m stuck,'” Sherbovich said.She looked in the rearview mirror and discovered Brayden had somehow gotten the free hanging middle seat belt wrapped around his neck. The locking