Abandoning infants was a heritage of the Roman Empire. Foundling hospitals were established in Italy earlier and in greater number than in other countries; their goal was to prevent infanticides. The Foundling Hospital in Rome, established in the Santo Spirito Church in 1204, paved the way toward modern hospital care and child protection. The Order of the Holy Spirit was appointed by Pope Innocent III to care for foundlings, and set up a network of infant nurseries all over Europe. Poor unmarried pregnant women received obstetric services free of charge. Infants were admitted anonymously by the ruota, a baby hatch or turning wheel. The Order's rule regulated infants' admission, care, nutrition by wet nurses, and boarding out to foster families in the countryside. Chief physicians of the Santo Spirito Hospital were often Sapienza University professors and/or personal physicians to the Popes. Among them were Realdo Colombo, Andrea Caesalpino, Giovanni Lancisi, Giuseppe Flajani, Domenico Morichini, and Tommaso Prelà. They made major scientific progress in anatomy and surgery: descriptions of the pulmonary blood transit, embryonic formation, fetal circulation, malaria transmission from mosquitos, and surgery for congenital malformations such as hydrocephalus, anal atresia, and cleft lip. Per year, 800-1,000 exposed infants were admitted. Despite sufficient funding and meticulous regulation of care and nutrition, mortality in the hospital during the first month of life was around 70%; the causes were neglected surveillance, cleanliness, and artificial nutrition. The institution persisted for more than 700 years due to numerous connections with the Vatican.