Some people believe that children should be exposed to normal food to build their immunity system. How can we as educators / parents promote the importance of taking organic products and to convince others that the price that we pay is worthwhile for the holistic development of a child?

It is very difficult to convince people (especially folks from our parents generation) to choose organic products as it is just not wallet friendly. Such things are sooo expensive in Singapore! I try to do so by planting little seeds in their heads, so that they will at least consider choosing food from a cleaner source... I tell my parents and in-laws that the farm land and seas are not as clean as before. Farm lands are over-cultivated and not fertile so need much more dependency on fertilizers. Same as the seas.. the waters are much more polluted and the larger fishes have more mercury in them. Maybe you could try this as a small start too?