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Lucia Vazquez, 33, a single New Yorker, is a sensible professional, her friends say. She works hard at her career as a medical-supplies saleswoman, invests in stocks, has owned a house and doesn't take undue risks.

So why did Ms. Vazquez recently spend $12,000 on a medical procedure -- freezing and storing her eggs for a possible future pregnancy -- that some experts warn has a low chance of success and shouldn't be used by women like her? With a busy career and no plans for marriage soon, Ms. Vasquez explains, egg freezing eases her worries "about the clock ticking."

At 38, sales manager Nicki Armstrong is among a growing number of women who are freezing their eggs in hopes of becoming pregnant later in life. WSJ's Sue Shellenbarger reports.

As more women delay marriage and child-bearing, a small but growing number are having their eggs frozen in hopes of improving their chances of having children later. Some fertility clinics are creating a buzz by marketing egg freezing on the Internet and through presentations to such groups as 85 Broads...