correct or not?

'Health professional' at polyclinic always say follow the packaging prescribe at the back of the milk tin, but that is just a guide. 'Health professional' at KKH say must always feed baby according to weight every 3 hours. But I feel this 'health professional' sucks. I feel that we should feed according to our baby calling because as parents we should know what is right and what is best for our baby. If you baby is hungry past the point, acid reflux may happen and it cause vomiting. This is why I feel like 'Health professional' from KKH and polyclinic are not really profession, if they are, they should know that every babies metabolism rate is different. Not all babies are the same. Am I right..?