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Don't get Chrissy Glen wrong.

After four years spent coping with the heartache of infertility treatments that didn't work, she considers herself blessed to have a healthy baby girl finally conceived through in-vitro fertilization.

Jenna is a gift, she says, but if they are lucky enough to produce another child, Glen and her husband, Tim, hope for a boy to balance the gender ratio in their family.

Two years ago, 16 of her eggs were mixed with his sperm in a laboratory dish, yielding seven embryos. Two were transferred into her uterus (only one implanted successfully), leaving five available for another shot at IVF.

Using a technique that tests the gender of their remaining embryos before they are placed in the womb, the Glens could all but guarantee themselves a boy next time.

"We would really like to have one of each," says the 34-year-old stay-at-home mom from Richboro, Bucks County. "So that is definitely something we are going to consider."

It's a brave new world in childbearing, where advances in reproductive technology mean Mother Nature doesn't necessarily determine whether...