Lack of vitamin D may be linked to skull softening in babies

Japanese researchers also found that breast feeding without vitamin D supplementation could prolong the deficiency. They also discovered that the condition increases in the winter months when pregnant women may not get enough sunshine.

The body produces vitamin D when the skin is exposed to sunlight.

More research is needed but researchers say many pregnant women may need to be treated with vitamin d.

There's more on the study in the Journal of Clinical Endocrinology and Metabolism.

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