Milk is frequently contaminated with antibiotics and excess vitamin D. Of 42 milk samples recently tested, only 12 percent were within the expected range of vitamin D content. Of ten samples of infant formula, seven had more than twice the vitamin D content reported on the label, and one had more than four times the label amount. The lactose sugar, when it is digested, releases galactose, a simple sugar which is linked to ovarian cancer and cataracts. Milk is one of the most common causes of food allergy. Often the symptoms are subtle and may not be attributed to milk for some time.
Milk proteins can cause colic, a digestive upset that bothers one in five infants.