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I understand you're not supposed to keep your kids in a bubble because exposure to germs will build their immune system. And I've heard that kids who go to preschool supposedly get sick less when they go to kindergarten than kids who stayed home. But I don't understand why this is preferable... is it better for young babies/toddlers to get sick than for a 5-year old to get sick?? I don't really understand how immunity build-up works, so can someone explain this to me? Seems like a younger child (who's developing at a faster rate) would miss out on a lot more developmentally-speaking when under stress due to a cold than an older child. So why should you expose kids to germs when they're younger?

I have a 2-year old (who is still breastfeeding and getting immunity benefits) and we stay at home... occasionally someone makes a comment implying that my dd should be in preschool/daycare so she'll have more exposure to other kids and so her immune system can develop. I'd like to understand how immunity works a little better so I know how to respond.