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On April 30, 1965, Life magazine ran Nilsson's colour photographs of human embryos and foetuses, with an 18-week foetus in its amniotic sac on the cover. The entire print run of eight million copies sold out within four days. It was the first time most of the public had seen what prenatal life looked like, and the images later won Picture of the Year and were chosen for the Voyager probes as a representation of humanity.
Only a few of the famous images were taken inside a living body with an endoscope. Most showed embryos and foetuses removed by surgery or miscarriage, which Nilsson posed, lit and backgrounded so they appeared to float alive in utero. The case shows how technical staging can make viewers read an image as a direct window onto reality when it is a constructed scene.
Cropping the foetus against a dark, starry-looking void and removing the uterus, placenta and mother makes it read as an autonomous, self-contained individual, like an astronaut in space. This framing shifts attention from the woman's body and circumstances to the foetus as an independent subject. That shift is why the images became tools in abortion debates and drew sustained feminist critique.
Pregnancy is charted as a timeline of milestones from conception to birth. The foetal months that follow are mostly growth and maturation. Because organs form so early, the first trimester is when drugs, infections and toxins do the most damage, which is the rationale for early antenatal care and caution.