GLENVIEW, Ill.--(BUSINESS WIRE)--Mead Johnson Nutrition Company (NYSE: MJN) today announced that it is revising full-year 2015 financial guidance based on preliminary second quarter sales results. Results are preliminary at this time as the Company has not yet completed its quarter close processes. Final Q2 results will be announced on July 23, 2015. Preliminary second quarter constant dollar sales(1) were 3% below the prior year quarter. Including the impact of foreign currency, preliminary re