When you're pregnant, you might look forward to having the baby "drop" as an indication that the end of pregnancy is in sight. This process, medically termed "lightening," generally occurs two to three weeks before labor starts in first pregnancies.

Benadryl, known generically as diphenhydramine, is an antihistamine medication approved for use in most children, says pediatrician William Sears on his website AskDrSears.com. Benadryl is used to treat swelling, itching, runny nose, rash and sneezing that can accompany an allergic reaction.