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It's confirmation bias. Like the vast majority of people, the vast majority of mothers are not critical thinkers or trained scientists, and will make assumptions based on their perception and their understanding of the world.
But it turns out that chocolate doesn't give you acne; it turns out going out in the cold doesn't cause you to catch a cold. There are thousands of beliefs that mothers have, that we all have, that are wrong. There is evidence all around us, that we can't see because we don't allow it in our brains.
Science demands an even more critical view of the child than the mother's view. It will only include unbiased, double-blind, direct observations and will throw out intuition, emotion and previously-held beliefs.
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