With preterm births, the babies' organs and bodily functions are not yet fully developed. These babies must undergo these growth stages outside the safety of the womb. A birth before the 37th week of pregnancy is considered premature - with risks of respiratory problems, brain hemorrhages, infections, and digestive complications. Thanks to medical advances, the prognosis for premature babies has improved significantly. Many children catch up on their development and go on to have normal and healthy lives. But the earlier a child is born, the more difficult the process and the greater the risks. Innovative ideas aim to provide more support for these infants. In Good Shape looks at a mechanical womb and an artificial placenta, and explores the ethical questions surrounding their future use.