In Reply.—Our study protocol implied that we were focusing primarily on sun exposure during the summer season. The summer season was chosen because an estimated 80% of sun exposure in the northern latitudes occurs during the spring and summer.1
We appreciate the attention drawn to the need to combine our recommendation for a decrease in unprotected sun exposure with the administration of supplemental vitamin D to breast-fed infants living in northern latitudes during the winter season.
BOLOGNIA JL, FINE JA, JASMIN M, BERWICK M, SIMPSON P. Sun Protection and Vitamin D Status in Infants-Reply. Am J Dis Child. 1992;146(11):1260. doi:10.1001/archpedi.1992.02160230018006