It is true. It is fact derived from study. Especially about allergy. There is also scientific explanation. In the early childhood our body immune system is developed. At that time our body recognize which one is harmful and which one is useful. So if anything exposed to body immune system before fully developed, body consider it as it's own part and so body don't produce immunity against it and that particular things become well tolerated by the body. So on the later part if that particular things again invade in out body, our body don't react against it as body take it as own things. The same thing happen in allergic condition.
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