Neonatology is a field of pediatrics that is related with the medical care of newborn infants. The newborn infants who are severely ill or premature need such special medical care. Other complications which require specialized care include prematurity, low birth weight, intrauterine growth restriction, congenital malformations, sepsis, pulmonary hypoplasia and birth asphyxia. It is generally practised in neonatal intensive care units. During this neonatal period, there are many diseases of concern. These include anemia of prematurity, atrial septal defect, brachial plexus injury, cerebral palsy, congenital heart disease, gastroschisis, lissencephaly, neonatal cholestasis, omphalocele, ventricular septal defect, etc. The development of mechanical ventilation and pulmonary surfactant replacement therapy in recent decades has improved the survival of premature infants. This book is a valuable compilation of topics, ranging from the basic to the most complex advancements in the field of neonatology. The various studies that are constantly contributing towards advancing technologies and evolution of this field are examined in detail. It will provide comprehensive knowledge to the readers.