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To the Editor:
We read with interest Dr Roth's commentary1 published in response to our lactation/vitamin D trial published in Pediatrics.2 Dr Roth raises points that question the validity and applicability of our study to clinical practice.
First, when designing this study, it is known that infant formula supplies adequate vitamin D at 400 IU/quart. The unknown question is, can human breast milk supply the same amount as infant formula or direct infant supplementation? If combined feeding with infant formula corrupted the study, the answer to the human milk question would never be determined. In our study, we did have many …