Chris Beggini, a 43-year-old mutual fund manager in Radnor, Pa., didn't know about the practice until his wife, Jennifer, straightened him out. "We talked about how she had nine months of difficulty, and 'Aren't I the good soldier?' blah blah blah," he recalled. So when the Begginis begat Abigail in 1999, Ellie in 2002, and Julia last year, Mr. Beggini responded with earrings, a bracelet and what he jokingly calls a "suffer ring."