Vitamin D Deficiency May Lurk in Babies

But once Aleanie started putting weight on her feet, her mother noticed that her legs were curving in a bow shape below the knees. Doctors diagnosed vitamin D-deficiency rickets, a softening of the bones that develops when children do not get enough vitamin D — a crucial ingredient for absorbing calcium and building bone, and the one critical hormone that breast milk often cannot provide enough of.

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Physicians have known for more than a century that exclusive breast-feeding may be associated with vitamin D deficiency and rickets, and that the condition is easily prevented and treated with inexpensive vitamin drops or cod liver oil. But doctors are reluctant to say anything that might discourage breast-feeding.

Now some researchers are also linking vitamin D deficiency with other chronic diseases like diabetes, autoimmune disorders and even cancer, and there have been calls to include blood tests of vitamin D levels in routine checkups.

“I completely support breast-feeding, and I think breast milk is the perfect food, and the healthiest way to nourish an infant,” said Dr. Catherine M. Gordon, director of the bone health program at Children’s Hospital Boston and an author of several studies on vitamin D deficiency, including Aleanie’s case.

“However,” Dr. Gordon continued, “we’re finding so many mothers are vitamin D deficient themselves that the milk is therefore deficient, so many babies can’t keep their levels up. They may start their lives vitamin D deficient, and then all they’re getting is vitamin D deficient breast milk.”