Cow’s milk is probably the most complicated recommendation, partly because it interacts with the allergen issues above. It is important to introduce some milk-based foods—yogurt, cheese—to avoid allergies. But milk itself is forbidden. The concern is that cow’s milk is not a complete infant nutrition system, and if your infant drinks a lot of milk, it will restrict formula or breast milk intake. In particular, infants who have cow’s milk as their primary milk source are more likely to be iron deficient.15 The evidence says only that you shouldn’t replace formula or breast milk with cow’s milk.
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