That's not how I read it, since there's already data protection laws for how to handle kids information. If the data is being used for it's intended purposes ("Parents, give us this information so we can use it in an emergency"), and there's some kind of safe-guard (Only teachers can see it), that should still be fine. What about that under the GDPR is not okay?

> What about that under the GDPR is not okay?

I don't know because I didn't write the original post. However your interpretation seems rather peculiar considering the last part of the sentence explicitly mentioned safety issues. One should surely give the original commentator the benefit of the doubt that he talking about a real issue and not just saying "I don't care about pupil's privacy"

These mesical data were supposed to be private by other laws even before - unless you have consent from parent.