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What if the first dose of MMR was given before the first birthday?

April 26, 2017birthday dose given MMR

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What if the first dose of MMR was given before the first birthday?

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There is a 4-day rule that allows the first dose of MMR to be given up to 4 days before the first birthday. If the MMR vaccine was given more than 4 days before the first birthday it is considered invalid and must be repeated.