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It like common sense to most parents to sure their baby is always in a clean place. Most parents do their best to dirt and bacteria away from their little ones. However, a scientist says dirt an important part of making babies stronger. Dr Jack Gilbert from the University of Chicago the ecosystems of bacteria. He did research into how dirt and bacteria children. He his research in a book called 'Dirt is Good: The Advantage of Germs for Your Child’s Developing Immune System'. He told America's NPR news station that: "It's fine to their hands if there's a…flu virus going around, but if they're with a dog and the dog their face, that's not a bad thing."

Dr Gilbert that letting children get dirty was largely beneficial. Exposing small kids to dirt them to build their immune system. Dr Gilbert even argues that children often allergies because parents try to protect their kids too much and try too hard to everything that children . He said parents now over-sterilize everything in the home. This children's immune systems to become too sensitive, which can to things like asthma, eczema, and food allergies. Gilbert even the "five-second rule". Many people it is OK to eat something that fell on the floor for fewer than five seconds. Gilbert says it is OK to something that fell on the floor as long as the floor isn't really dirty.

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