Cornair says in her lawsuit that a server handed a cardboard drink holder to the boy, who suffered second-degree burns when the coffee spilled on his left leg.
A McDonald's spokesman says he cannot comment on the lawsuit, but says customer safety is the restaurant's top priority.
An 82-year-old New Mexico woman sued McDonald's for $2.7 million when she was scalded by coffee in 1994. An appeal reduced that to $640,000 and she later settled for an undisclosed amount.
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