Oksana Grigorieva has been handed a legal setback in her ongoing custody dispute with Mel Gibson, RadarOnline.com has exclusively learned.

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Oksana's mega lawyers, Sorrell Trope and Anne Kiley petitioned to have a new pediatrician appointed for baby Lucia, and Judge Scott Gordon denied that request.

It is the first setback for Oksana's new legal team since formally taking the case.

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Sources familiar with the situation tell us that Oksana wanted a new pediatrician for Lucia, and Judge Gordon didn't think that was necessary, and denied the motion.