A lot of injuries are happening from bottom belts cutting into bellies, because people don't know how to position the belt properly or the belt doesn't position

A lot of injuries are happening from bottom belts cutting into bellies, because people don't know how to position the belt properly or the belt doesn't position well for people who have bellies (many women over middle age, pregnant women, etc). It's not just average height and weight that matters. Soft tissue positioning matters a lot. Women tend to accumulate weight in hips (pear shape), while men usually do it in the belly, so elevated thigh diameter in women when seated pushes the bottom belt up onto the belly/soft tissue which then gets cut during an accident. Regulators need to surface and approve belt adjusters that make seat-belts safer for pregnant and overweight people.