Neonatology (also neonatal medicine) is a subspecialty of pediatrics concerned with the care, development, and diseases of newborn infants, particularly those born prematurely or in need of critical care. Neonatologists are medical doctors who specialize in the care of newborns, often working in neonatal intensive care units (NICUs). Neonatal care often involves a multidisciplinary team to provide intensive monitoring, respiratory and nutritional support, neonatal resuscitation and transport, and support for families facing complex medical decisions. Conditions commonly managed include complications of prematurity, respiratory disorders, neonatal infections, and congenital anomalies.
The neonatal period is generally defined as the first 28 days of life, during which newborns are especially vulnerable. Advances in neonatal medicine, including incubator technology, mechanical ventilation, phototherapy, and pulmonary surfactant therapy, have contributed to substantially improved survival and outcomes for premature and critically ill infants. Modern neonatal care is delivered in a range of settings, including delivery rooms, newborn nurseries, and NICUs. Neonatology is also an academic discipline that includes clinical and basic science research. Ethical and medical-legal issues often involve decisions about life-sustaining treatment, in which parents and clinicians may need to consider expected survival, suffering, and disability.
Historical developments Though high infant mortality rates were recognized by the medical community at least as early as the 1860s, advances in modern neonatal intensive care have led to a significant decline in infant mortality in the modern era, falling from 5 million deaths globally in 1990 to 2.3 million in 2022. This has been achieved through a combination of technological advances, enhanced understanding of newborn physiology, improved sanitation practices, and development of specialized units for neonatal intensive care. Around the mid-19th century, the care of newborns was in its infancy and was led mainly by obstetricians; however, the early 1900s, pediatricians began to assume a more direct role in caring for neonates. The term "neonatology" was coined by Dr. Alexander Schaffer in 1960. The American Board of Pediatrics established an official sub-board certification for neonatology in 1975.
In 1835, the Russian physician Georg von Ruehl developed a rudimentary incubator made from two nestled metal tubs enclosing a layer of warm water. By the mid-1850s, these "warming tubs" were in regular use at the Moscow Foundling Hospital for the support of premature infants. In 1857, Jean-Louis-Paul Denuce was the first to publish a description of his own similar incubator design, and was the first physician to describe its utility in the support of premature infants in medical literature. By 1931, Dr. A Robert Bauer added more sophisticated upgrades to the incubator which allowed for humidity control and oxygen delivery in addition to heating capabilities, further contributing to improved survival in newborns.
The 1950s brought a rapid escalation in neonatal services with the advent of mechanical ventilation of the newborn, allowing for survival at an increasingly smaller birth weight.
In 1952, the anesthesiologist Dr. Virginia Apgar developed the Apgar score, used for standardized assessment of infants immediately upon delivery, to guide further steps in resuscitation if necessary.
The first dedicated neonatal intensive care unit (NICU) was established at Yale New Haven Hospital in Connecticut in 1965, an effort led by Dr. Louis Gluck. Prior to the development of the NICU, premature and critically ill infants were attended to in nurseries without specialized resuscitation equipment.
In 1968, Dr. Jerold Lucey demonstrated that hyperbilirubinemia of prematurity (a form of neonatal jaundice) could be successfully treated through exposure to artificial blue light. This led to widespread use of phototherapy, which has now become a mainstay of treatment of neonatal jaundice.
In the 1980s, the development of pulmonary surfactant replacement therapy further improved survival of extremely premature infants and decreased chronic lung disease, one of the complications of mechanical ventilation, among less severely premature infants.
Academic training After completing medical school and specialty training in pediatrics, doctors undertake additional subspecialty training focused on neonatal care. Neonatal training programs generally involve several years of supervised clinical practice and culminate in subspecialty certification through national medical specialty boards or colleges. Among pediatric subspecialties, neonatology is the most widely available globally. Formal training opportunities in neonatology are less common in low-income countries than in middle- and high-income countries.
In the United States, residency and fellowship programs are accredited by the Accreditation Council for Graduate Medical Education, which sets national standards for specialty and subspecialty medical training. Physicians with MD or DO degrees complete a three-year residency in pediatrics followed by a three-year fellowship in neonatal–perinatal medicine. Subspecialty certification is administered by the American Board of Pediatrics. Osteopathic physicians may also obtain certification through the American Osteopathic Board of Pediatrics.
In Mexico, medical doctors complete a three-year pediatrics residency before entering a two-year neonatology specialty program. Certification in neonatology is administered by the Mexican Council for Certification in Pediatrics.
In the United Kingdom, after graduation from medical school and completing the two-year foundation programme, a physician wishing to become a neonatologist would enroll in an eight-year paediatric specialty training programme. The last two to three years of this would be devoted to training in neonatology as a subspecialty.
In Canada, subspecialty training in neonatal–perinatal medicine is accredited by the Royal College of Physicians and Surgeons of Canada, which sets national standards for postgraduate medical training and certification. Neonatology programs are typically two-year fellowships following a four-year pediatric residency.
In Australia and New Zealand, neonatal–perinatal medicine training is overseen by the Royal Australasian College of Physicians, which administers physician and pediatric subspecialty training programs across both countries. Trainees complete three years of pediatric training followed by a structured three-year advanced training program in neonatal and perinatal medicine.
In India, neonatology training is undertaken after postgraduate training in pediatrics and is provided through several pathways. Fellowship programs typically last 12 to 18 months and are overseen by the National Neonatology Forum of India and the Indian Academy of Pediatrics. An additional pathway is offered through the National Board of Examinations in Medical Sciences, which administers the three-year Diplomate of National Board (DrNB) in Neonatology.
In South Korea, board certification in neonatology is available to pediatricians who have completed a four-year pediatrics residency and passed the pediatrics specialist examination. Candidates then complete two years of neonatology training at hospitals designated by the Korean Society of Neonatology, including at least one year as a fellow, before taking written and oral examinations administered by the Korean Pediatric Society.
In Tanzania, neonatology subspecialty training is offered through the Muhimbili University of Health and Allied Sciences, accredited by the Tanzania Commission for Universities, as a Master of Science in Clinical Neonatology. It is a two-year degree program, designed for medical doctors who have completed training in pediatrics, with graduates awarded a neonatology subspecialty certificate.
Scope
Neonatal medicine addresses conditions affecting infants during the neonatal period, generally defined as the first 28 days of life. Worldwide, the leading causes of neonatal death are premature birth, neonatal infections, birth complications (e.g., asphyxia, trauma), and congenital anomalies. Routine newborn care includes thermal protection (e.g., skin-to-skin contact between parent and infant), hygienic umbilical cord and skin care, breastfeeding, clinical assessment for signs of illness, and preventive measures (e.g., vaccination, vitamin K injection). While newborns are cared for in many settings, neonatologists typically work in hospitals or neonatal intensive care units (NICUs), where they care for premature or critically ill infants and may also oversee the evaluation and management of healthy newborns. In academic medical centers, neonatologists may participate in clinical and basic science research and may follow infants after discharge to assess long-term developmental outcomes.
Neonatology involves conditions related to fetal growth and development, complications arising from maternal disorders during pregnancy, and problems associated with labor, delivery, and the physiologic transition from fetal to extrauterine life. Neonatologists diagnose and manage genetic and chromosomal disorders, inborn errors of metabolism, infections acquired before, during, or shortly after birth, and disorders involving all major organ systems. Care is often delivered by multidisciplinary teams that may include neonatologists, neonatal nurses, respiratory therapists, dietitians, lactation consultants, physical therapists, pharmacists, social workers, and pastoral care. Neonatal transport involves stabilizing and transferring critically ill or high-risk newborns between facilities, often from birth hospitals to centers with higher-level neonatal intensive care.
Investigations Investigations relevant to neonatology may begin before birth when fetal or maternal findings suggest risk to the newborn, typically through prenatal evaluation by obstetricians or maternal-fetal medicine specialists. Based on this evaluation, neonatologists may become involved before delivery to counsel families and plan care for newborns expected to require delivery-room stabilization or intensive care. Prenatal ultrasound is the primary imaging technique used to estimate gestational age, assess fetal growth, and identify structural anomalies. Fetal echocardiography, genetic screening, amniocentesis, and chorionic villus sampling may be used to further evaluate suspected disorders.
After birth, evaluation includes Apgar scoring and physical examination, with immediate assessment of breathing, heart rate, muscle tone, and the need for resuscitation. Growth is assessed by repeated measurements of weight, length, and head circumference, with interpretation adjusted for gestational age. Continuous monitoring of heart rate, respiration, blood pressure, temperature, and oxygen saturation is common in NICUs for the detection of apnea, hypoxemia, hypotension, fever, and other forms of instability.