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 and cons is a noun expression that means the advantages and the disadvantages -- the favourable and the unfavourable, the benefits and the drawbacks. It's a shortening of the Latin phrase pro et contra (for and against) and in use for centu...