I admit that it's been a long time since I last read Greg's books, but I'm pretty sure the augmented embryos were never "injected" into the wombs of surrogate mothers to gestate; they started off in the womb like ordinary foetuses.
Also, in the books, I don't think they required "fathers"; they could be conceived by just one parent. But please correct me if I'm misremembering.
The two dozen embryos arrayed upon the counter, each one no more than a few millimeters long and each suspended in a sterile dish containing an artificial growth medium of [Kaur's] own invention, were the end of a long and meticulous process of elimination and experimentation, expressly designed to create human embryos genetically superior to those created through the random genetic shuffling of ordinary reproduction.
The process had begun by inducing superovulation in all of the project's female volunteers, including herself. The large and divers assortment of eggs yielded by this procedure had been inseminated artificially and allowed to incubate at a temperature of precisely thirty-seven degrees centigrade, i.e., body temperature. Following fertilization, the eggs had been carefully examined for a wide variety of genetic defects or abnormalities, with all unsuitable eggs immediately terminated and disposed of.
...
Careful screening of hundreds of test samples had winnowed the selection down to a mere two dozen eggs, which had then been allowed to develop into the embryos currently awaiting Kaur's final inspection. Of those candidates, only those she judged suitable would be implanted in the surrogate mothers who had agreed to carry the babies to term.
One of these days we really have to develop some workable artificial wombs, Kaur reflected. That would place yet one more crucial stage of human development under deliberate scientific control, not to mention sparing the project the burden of having to constantly recruit new surrogate mothers.
Does it really matter? Due to there nature, the books and TV programmes will be inconsistent.
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