Dr. Mitalipov said his lab had tried transplanting entire blastocysts into a monkey's womb, but those experiments hadn't yielded a single successful pregnancy.

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England assumed many of the fathers would have high-tailed it out of the picture by the sixth month of pregnancy, leaving single mothers "truly single, " the sociologist said.

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The pregnancy rate among those given single embryos was 39.7%, compared to 43.5% in the double embryo group.

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Amanda said when she goes back to Ulysses to see her family and friends, she listens to the list of babies recently born to single parents and realizes that attitudes about teen pregnancy there haven't changed much.

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McCorvey was a single mother, pregnant for the third time, who wanted to terminate her pregnancy.

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As for the general Medicaid population, the single greatest medical demand placed on the program, in terms of volume if not dollars, is pregnancy and childbirth.

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