Doctors have used ground-breaking surgery on an unborn baby to successfully correct a birth defect while he was still inside the womb. His mother, Maisie Savage, from London, was operated on by doctors in the US while she was 26 weeks pregnant. Baby Theo, who is now five months old and thriving, had gastroschisis, where the belly button does not develop properly, causing the intestines to grow externally. Maisie, 29, and Theo's father, Josh French, 36, both teachers, say they are incredibly relieved by the success of the pioneering surgery. In the best-case scenarios, babies can require weeks in intensive care and nutritional feeding through a tube or IV and corrective surgery.