Q: Should we allow my friend to bring her one-month-old to the wedding?

A: Not only should you not make an exception, but a wedding is no place for a baby that young. "At that age, his immune system isn't completely developed, so he shouldn't be exposed to a large group of people," says Heather O'Donnell, M.D., a New York City pediatrician. "He won't be getting his first round of vaccinations until he's two months old, so he's also at a much greater risk for bacterial infections." If your friend is uncomfortable leaving her son for such an extended length of time, she could consider going to only the ceremony or reception or trading shifts with her husband so they can each attend a portion of the event.

See all questions about family, friends, and guests etiquette

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