The Professional Sports Wives Association says that this nine-year-old company is the best place to turn for highly vetted nannies. Only 3 percent of recruits make it through the interview process, an acceptance rate that’s more competitive than Harvard’s. They’ll do it all: grocery shopping, your kids’ laundry, and, of course, the basics of feeding and bathing. Placement fees start at $1,500 for a full-timer.