The nurse that you saw probably has not read a medical journal in the last 20 years! It used to be believed that bf babies lacked iron, as bm is low in iron. But we know now that bf babies have much better iron levels as nearly all the iron in bm is absorbed, whereas only a very small amount of iron in food and formula is absorbed (which is why there needs to be so much in there!). Many people are surprised to learn that around 95% of iron in bm is absorbed, whereas less than 5% of the iron in iron fortified baby cereals is absorbed. Sadly some people are still advised to give babies cereal to keep their iron levels up, and in fact it has the opposite effect if the bm intake drops as a result.
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