Theoretically, it is possible that diphenhydramine could affect a woman's milk supply, since the medication can suppress prolactin (a hormone important for breast milk production). However, this is probably not an issue for women who are well-established with breastfeeding.
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As If. The phrase pro forma is Latin for as if, and the idea of a pro forma performance report is that it represents the company's earnings as if one or more expenses had not occurred.