Clara Sunderland was recently born in southern California. Her mom, Wendy, says a breast-feeding support group on Facebook has been crucial to learning how to breast-feed. Courtesy of Wendy Sunderland hide caption

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Courtesy of Wendy Sunderland

San Francisco lactation counselor Caroline Kerhervé — with kids of her clients — during a weekly session of a new mothers' group she coached in May. Courtesy of Caroline Kerherve hide caption

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Courtesy of Caroline Kerherve

An orangutan mother and her 11-month old infant in Borneo. Orangutans breast-feed offspring off and on for up to eight years. Tim Laman/Science Advances hide caption

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Tim Laman/Science Advances

Orangutan Moms Are The Primate Champs Of Breast-Feeding

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There's overwhelming consensus that breast-feeding is the optimal way to feed an infant. But the topic of how breast-feeding may influence cognitive ability is controversial. Guerilla/Getty Images hide caption

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Guerilla/Getty Images

Breast-Fed Kids May Be Less Hyper, But Not Necessarily Smarter, Study Finds

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This happens, pediatricians acknowledge. So they're offering advice on how to reduce the risk of bed sharing with infants, which includes removing loose bedding that could lead to suffocation. PhotoAlto/Anne-Sophie Bost/Getty Images hide caption

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PhotoAlto/Anne-Sophie Bost/Getty Images

The number of women buying, selling and sharing breast milk is growing rapidly. But it can be a risky purchase, scientists say, because a mom can't tell by looking at the milk whether it's safe and nutritious for her baby. iStockphoto hide caption

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iStockphoto

Breast Milk Sold Online Contaminated With Cow's Milk

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Brazilian mothers participate in a demonstration in 2011 for the right to breastfeed in public, in Sao Paulo, Brazil. Eduardo Anizelli/STF/LatinContent/Getty Images hide caption

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Eduardo Anizelli/STF/LatinContent/Getty Images

Breast-Feeding Boosts Chances Of Success, Study In Brazil Finds

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A Mexico City breast-feeding campaigned used posters featuring topless celebrities. At least "La Barbie," a female boxer (shown here), had her boxing gloves on. Via Latin Times hide caption

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Via Latin Times

Mexico City's Campaign To Encourage Breast-Feeding Backfires

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Madison Fitzgerald, 20, holds her baby, Jake, in the neonatal intensive care unit at Texas Children's Hospital in Houston. Jake, who was born 16 weeks too early, receives donor breast milk every three hours by mouth. Carrie Feibel/KUHF hide caption

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Carrie Feibel/KUHF

Booming Demand For Donated Breast Milk Raises Safety Issues

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That's how it's supposed to work. But for most new moms, breast-feeding doesn't come easily, a study finds. iStockphoto.com hide caption

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iStockphoto.com