Some experts say we are seeing a surge in allergies due to the sterile environment industrial cultures provide. This may or may not be true.

Other experts say that it is good for children to get colds while growing up so their immune system can develop properly. If a child doesn't eat sugar and eats a balanced diet with ample amounts of vitamins, minerals, antioxidants, fatty acids, and amino acids wouldn't these be protective against germs/illness?

Are children who don't get colds/flu not developing a stronger immune system OR is it that their immune system is strong enough to balance the body so it doesn't come down with a cold/flu?

All this is highly variable and doctors like to make broad sweeping generalizations.. Vaccines will prevent the building of some natural immunity and create temporary artificial immunity. Many vaccines do not provide enduring immunity. If a child is breastfed some natural immunity will develop at that time... but even some of this may be temporary.. it is as of yet unclear.

Diet will help when the pathogen comes for the child with have the nutritional resources to amp up the immune system to make the appropriate response... still they can be sick for several days to a week as their immune system jumps through all the ropes to reprogram itself.

Children often have many small sicknesses upt to the age of 5 or 6. This is the immune system building time to the most common virus that get gets passed around. What they dont contact in these first years they will get latter, likely. This is all normal. Some people seem to have preprogramed immune systems and even as children they don't go through all the colds and flu, nor even as adults. My mom was like that. I might have been a lot healthier if I was breastfed for she had what it takes.

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Vitamin D3 and MELATONIN are the most significant factors for immune function. So Bright Sunlight exposure on as much skin as possible through the day and early to bed with no lights in bedroom at night. In winter when no Vitamin D is possible from sunlight then 1000iu/daily vitamin D3 for each 25lbs the child weighs should be adequate.

I think it's better for healthy children to be exposed to whatever childhood diseases are circulating and I think if their Vitamin D3/Melatonin status is fine they will be better for it. Whether they get the illness or shrug it off makes no difference.

I think it's worth checking the diets of kids from time to time as it isn't just vitamin d3 and melatonin,. I'd be looking at vitamins A, B6, B12, C, D, E and folic acid and the trace elements iron, zinc, copper and selenium all work in synergy to support the protective activities of immune cells