No I'm not changing the argument. I'm saying that if he'd done the test, and it showed she had meningitis, then he would have been justified in calling the cops. Short of that, he was not justified in calling the cops. That's exactly what you just said. How is your conclusion different from mine?
What are you talking about? The cops were called because the parents refused to allow the test. Without the test, there's no certainty it's meningitis. Testing the spinal fluid is the only way. To get the fluid they had to puncture the baby's spinal cord. The parents were not going to allow that. You're agreeing that the child should be tested against the parents' will by what means? The hospital staff making a citizen's arrest? Bodily removal by orderlies?