Over two decades, researchers have seen increased use of calcium, vitamin D and folic acid.

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It said vitamin D and folic acid supplements should be offered by health staff to help ward off conditions such as rickets and spina bifida.

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Health experts now recommend that women who are planning to become pregnant take a supplement of vitamin D as well as folic acid.

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The latest figures also show that fewer women are smoking and drinking alcohol during pregnancy and more are taking recommended supplements - folic acid and vitamin D.

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When Beth Anderson organized a meeting of other parents of babies with acid reflux in Washington, D.

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