Child support is subject to modification retroactive to the original date of filing. If the original claim was dismissed outright you may have cause to contest any backdating. It it was not dismissed, just postponed for review then you may be on the hook for retroactive support. You may want to consider consulting with a lawyer.
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You may still be obliged to pay support obligation for your child despite being denied federal disability benefits. Speak with a family court attorney and convince them that you are willing to pay a reasonable fee for services so that you will not be "denied obtaining a lawyer" again.
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