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Because babies are more prone to developing complications from some of the diseases we vaccinate against. That's why children need to be immunized early in life - so they are protected as early as possible.

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10y ago
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11y ago

Actually, every childhood vaccine I normally see requires more than one doses: Heb B - 3, Hib - 4, IPV - 4, PCV - 4, MMR - 2, Var - 2, Hep A - 2, and DTaP - 5. Children get above vaccines up to around 5 year-old.

Your immune system works base on exposure. The more you are exposed to an antigen (foreign particles), the more likely it will learn to make antibodies against those antigens. Since the vaccines are often only composed of parts or weakened bacteria or virus, they may not induce an immune response as strong as 'natural' infections.

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10y ago

Children have less margins than adults if they get sick, so they need the protection of vaccines more than adults. Also, some vaccines don't wear off, so it makes sense to get them on board as soon as possible.

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4y ago

hi

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Q: Why are vaccinations given only when child is small?
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