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.
PRO is a strategic communications firm helping high profile individuals, professional teams, national governing bodies, corporations and non-profits within the sports industry build their brands through the media.
Pro is defined as on the yes side. An example of pro used as an adverb is in the phrase pro healthy eating, which means in favor of healthy eating. The definition of a pro is a professional, or the yes side of a debate question. An example of a pro is a Major League Baseball player. An example of a pro is the side of the argument that disagrees with those who hold the con position.