Join Date: Sep 2003
Location: Running with the dingos!
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Here's the info you need:
(1) The bioavailability (the amount of a nutrient that the body can actually absorb) of the nutrients in each fluid differs markedly. For example, human babies can absorb 67% of the calcium in human milk compared to only 25% of the calcium in cow's milk.
(2) The calcium concentration of human milk is just 26 milligrams per 100 milliliters (~3 oz) compared to 113 mg per 100 mL in cow's milk.
(3) A 1 year old needs 800 mg of Ca per day, *assuming* it comes from cow's milk. That means the baby needs to be absorbing 200
mg per day (based on the fact that 25% is actually absorbed from cow's milk). That translates to about 20 oz of cow's milk.
(4) Since 67% of Ca is absorbed from breastmilk, a baby needs 3/2*200, or 300 mg of calcium from breastmilk souces. At 26 mg/ 100 mL calcium in breastmilk that means a baby needs to drink 1150 mL (~38 oz) of breastmilk a day to completely fulfill her calcium needs.
No cow ever has to enter the picture as long as babe is getting significant amounts of breastmilk.