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    Once you become a parent, the world seems a filthy, germ-ridden place. You can’t look at a doorknob or a waiting room magazine without worrying about the microscopic enemies squirming invisibly on the surface.

    Meanwhile, your baby has different ideas. “In the first few years of life, babies put everything into their mouths,” says Robert W. Frenck Jr., MD, professor of pediatrics at the Cincinnati Children's Hospital Medical Center. “Absolutely everything.”

    For a parent, it isn’t easy. How are you supposed to keep your baby healthy when her greatest aspiration is to seek out disgusting things to stuff in her mouth? To give you some guidance on what germ precautions you should take -- and which worries you can shrug off -- WebMD turned to the pros: pediatricians and experts on infectious disease. Here’s what they had to say.

    Keeping Baby Healthy: Understanding Germs

    As a parent, it’s easy to get stressed out about germs. Some can cause serious illnesses that are especially dangerous to young children. But the next time you have to fish something germy and disgusting out of your baby’s mouth, take heart. Babies have immune systems that are more resilient than you might think.

    “In our environment, we’re exposed to hundreds and hundreds of antigens a day, from dust to pollen to viruses and to bacteria,” Frenck says. “The fact is that our immune systems do very well in protecting us.”

    Germ exposure is also just part of growing up. “Germs are unavoidable,” says Tanya Remer Altmann, MD, a pediatrician and author of Mommy Calls:Dr. Tanya Answers Parents' Top 101 Questions About Babies and Toddlers. “They’re everywhere, and part of being an infant and toddler is being exposed to lots and lots of them.”

    Exposure to germs builds up a baby’s immune system. Once the body is infected by a specific virus, it learns how to make antibodies to fight it. The next time it’s exposed, the body can fight it off without getting an infection.

    That said, you never want to deliberately expose your child to bacteria or viruses.

    “I would never advocate giving a child a virus purposefully to build immunity,” Frenck says. They get plenty of exposure to germs naturally. “But you also don’t want to keep children in cocoons to prevent exposure because it’s not going to work.”

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