In Reply.—I am particularly pleased to respond to Dr Rogers' letter because he raises issues that are importtant and to which I believe there are completely satisfactory answers.
First, consider the issue of iron sources for most infants. Remember that we are here recommending a population approach that is appropriate as long as there is no harm and no excessive cost. The fortunate infants under Dr Rogers' care do not typify the population and most of them undoubtedly have done well with their iron nutrition. Many American infants are not offered fortified solid foods early on, and 10 or 15 years ago, this group had a very high incidence of iron deficiency. Some of those taking "low-iron" formulas still do. An analogy would be to oppose adding vitamin D to milk because many infants have enough sun exposure to avoid rickets.
Second, Dr Rogers raises the issue of symptoms experienced by