Human milk can reduce radioactive exposure. All babies begin to accumulate radioactive strontium in their bones before birth. For the breast-fed baby, the body content of strontium lowers as your baby excretes more than is taken in. However, the artificially” fed baby has increased strontium in his bones, as cow's milk can contain 6 times as much strontium as human milk. The mineral content balance of cow's milk ensures it is deposited on your baby's bones.