The Heimlich works by forcing air up from the lungs to push the blockage out. But here's what most parents don't know. By the time you get into position, the choking child has already exhaled trying to cough. The lungs are empty.
You're compressing a chest that has nothing left to push with.
It's like squeezing a water bottle that's already been crushed flat. That's not technique. That's physics. And it's why the Heimlich fails 25 to 30 percent of the time, even when performed correctly. With shaking hands and an adrenaline-flooded brain, that number gets worse.
Hospitals don't rely on the Heimlich alone. When it fails, they use suction, because suction doesn't need the lungs to cooperate. It pulls the obstruction out the same way it went in.
That answer exists outside the hospital too. And it's simpler than you think.