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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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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This model of a molar shows color-coded barium banding patterns that reveal weaning age. Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health hide caption

itoggle caption Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health

Some insurers prefer to pay for manual breast pumps, but some working moms prefer more expensive, electric models. iStockphoto.com hide caption

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Ashley Beecher, 29, and her daughters Annie (on lap) and Charlie. After feeding Annie, Beecher donates her extra supply to the human milk bank at Texas Children's Hospital. KUHF hide caption

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A nurse burps a baby after he's been fed, circa 1955. Doctors say that for babies with extreme reflux, off-label use of heartburn drugs can sometimes help. But frequently changes to the mother's diet can be a simpler fix. George Heyer/Three Lions/Getty Images hide caption

itoggle caption George Heyer/Three Lions/Getty Images