so if the little one is using C4 explosive in their drive to ruin your phone I doubt you will get any acceptable responses. keep it locked in a safe or maybe stop your little one from vandalising or launching your device. cases are such a personal decision so search up military grade S21 phone protection and see what's what. a decent screen protector will also be required but the S21 already has one factory fitted. all depends what your little one is subjecting the device to but if they are wanting to destroy it, and you let them, nothing will protect it 🤣