Fill half their plate with fruits and vegetables
Fever-reducing medicine such as acetaminophen (Tylenol) or ibuprofen (Advil orMotrin) is one of the simplest and most effective ways to bring down a fever.
What doesn't limit the range of moton from the things which you've mentioned would be age. Age per se doesn't really limit the range of motion - while there are factors which negatively influence our range of motion and which are strongly correlated with age, it is hard to say that age itself would be the cause of a limited range of motion.
