Erratum: instead of diets replace it with the word dirts.

Children below 10 years old must never be given any form of antibiotic because the first 10 years of life is crucial period of immune system development. After this period, limited forms of vaccines may be given. But slight exposures to some form of diets may act as vaccine or a vaccine in itself. Those children that were exposed to antibiotics below 10 years are vulnerable to heavy or chronic infections.