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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Pros: Historically Accurate, Suspenseful, Artistically Rendered. Cons: Characters not fully developed. Valkyrie appears to be getting panned in some circles, while garnering high ratings in others. I went to see this film the day after it was released...so I was unaware of the widespread dissatisfaction with this film.