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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Pro-form is a word or phrase that can take the place of another word (or word group) in a sentence. The process of substituting pro-forms for other words is called proformation. In English, the most common pro-forms are pronouns, but other words (such as here, there, so, not, and do) can also function as pro-forms. (See Examples and Observations, below.) The pro-form is the referring word in a sentence; the word or word group that's referred to is the antecedent.