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How long will your child be going out of state?
In that case, no, you will not need to alter the child support agreement.
Child support can only be altered by a judge, and you would only bring the issue to a judge if the custodial situation for the child was going to significantly change for a long period of time. Under the circumstance you've described, it would not be worthwhile to alter the child support for such a short period of time, and a judge would likely not even entertain it given the time-span involved here.
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