A flexible polyurethane foam with improved resistance to discoloration from oxidation is disclosed. Such discoloration may be due to exposure to oxides of nitrogen, for example, the oxides commonly found in burnt gas fumes. The foam may be used for applications such as intimate apparel and other consumer products that need extended term color stability. The foam composition includes high levels of reactive and non-reactive phosphite esters that improve color stability without disadvantage to the foam's physical and aesthetic properties during and after production.