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In this drawing provided by the Children’s Hospital of Philadelphia, an illustration of a fluid-filled incubation system that mimics a mother’s womb, in hopes of one day improving survival of extremely premature babies. In animal testing, fetal lambs grew for up to four weeks inside a bag filled with a substitute for amniotic fluid, while the heart pumped blood into a machine attached to the umbilical cord that supplied oxygen like a placenta normally would. (Children’s Hospital of Philadelphia via AP)

In this drawing provided by the Children’s Hospital of Philadelphia, an illustration of a fluid-filled incubation system that mimics a mother’s womb, in hopes of one day improving survival of extremely premature babies. In animal testing, fetal lambs grew for up to four weeks inside a bag filled with a substitute for amniotic fluid, while the heart pumped blood into a machine attached to the umbilical cord that supplied oxygen like a placenta normally would. (Children’s Hospital of Philadelphia via AP)

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