A sales assistant adjusts stock of SMA powdered baby milk made by Pfizer in a Tesco store in London, U.K., on Monday, March 19, 2012. Surveys this month indicate that the U.K. economy returned to growth in the first quarter after a 0.2 percent contraction in the last three months of 2011. Photographer: Jason Alden/Bloomberg
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The mother of a toddler participating in a Procter and Gamble consumer research study changes her daughter's diaper a diaper test at P&G's baby care laboratory in Cincinnati, Ohio, U.S. on Friday, Feb. 28, 2014. Luke Sharrett for Bloomberg
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A sales assistant adjusts stock of SMA powdered baby milk made by Pfizer in a Tesco store in London, U.K., on Monday, March 19, 2012. Surveys this month indicate that the U.K. economy returned to growth in the first quarter after a 0.2 percent contraction in the last three months of 2011. Photographer: Jason Alden/Bloomberg
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The mother of a toddler participating in a Procter and Gamble consumer research study changes her daughter's diaper a diaper test at P&G's baby care laboratory in Cincinnati, Ohio, U.S. on Friday, Feb. 28, 2014. Luke Sharrett for Bloomberg