Neonatal medicine, or neonatology, 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 medical management of newborns, especially critically ill or premature infants, most often in specialized neonatal intensive care units (NICUs). Conditions commonly managed include prematurity and its complications, 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. falling from 5.0 million deaths globally in 1990 to 2.3 million in 2022. 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. By the mid-1850s, these "warming tubs" were in regular use at the Moscow Foundling Hospital for the support of premature infants.
thumb|Nurse using an oxygen meter to monitor oxygen levels in a neonatal incubator, 1950s.
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.
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. This led to widespread use of phototherapy, which has now become a mainstay of treatment of neonatal jaundice.
thumb|Neonatologist speaking with parents, [[Los Angeles, CA, 1976.]]
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.
thumb|[[Residency (medicine)|Resident doctor examining a newborn in the neonatal intensive care unit, San Diego, CA]]
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. Osteopathic physicians may also obtain certification through the American Osteopathic Board of 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.
thumb|[[Neonatal intensive care unit in India with newborns in incubators.|319x319px]]
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.
Scope
thumb|Full-term infant immediately after birth, with [[umbilical cord intact.]]
thumb|[[Preterm birth|Preterm infant receiving nasal CPAP in a neonatal intensive care unit.]]
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. 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 neonatal 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 congenital, chromosomal, infectious, cardiac, or growth-related disorders.
thumb|Blood collected from an infant's heel for routine [[phenylketonuria screening.]]
After birth, evaluation includes Apgar scoring, physical examination, routine newborn screening, and assessment of cardiorespiratory, nutritional, and developmental status. Growth is assessed by repeated measurements of weight, length, and head circumference, with interpretation adjusted for gestational or postmenstrual age. Newborn screening may include blood spot testing for selected metabolic, endocrine, hematologic, and genetic disorders, as well as hearing screening and pulse oximetry screening for critical congenital heart disease. Continuous monitoring of heart rate, respiration, blood pressure, temperature, and oxygen saturation is commonly used in NICUs to detect apnea, hypoxemia, hypotension, fever, and other forms of instability.
Thermoregulation involves measures to prevent hypothermia, such as drying, skin-to-skin contact, radiant warmers, and incubators. Neonatal incubators are used for preterm or clinically unstable newborns to maintain a controlled thermal environment. Some incubators also allow for regulation of relative humidity and oxygen concentration, which may be used to support temperature stability and reduce evaporative water loss. In preterm infants, nutritional management aims to support growth and reduce the risks of undernutrition, feeding intolerance, necrotizing enterocolitis, and complications of parenteral nutrition. For infants with life-limiting conditions, extreme prematurity, or serious congenital anomalies, neonatal care may include palliative care focused on symptom management, family support, and emotional care. For this reason, pediatric decision-making generally relies on parental authority rather than patient autonomy. Parental authority is limited by laws that aim to protect children from harm and by ethical permissibility and medical feasibility.
In the care of critically ill newborns, decisions often involve whether life-sustaining treatment should be provided, withheld, or withdrawn. In the United States, the Baby Doe Law, a 1984 amendment to the Child Abuse Prevention and Treatment Act, required state child protective services to establish procedures for reporting the medical neglect of disabled newborns, which the law defines as the withholding of treatment unless a baby is irreversibly comatose or the treatment is futile and inhumane. This federal regulation applies only to infants and is intended to prevent discrimination on the basis of disability. The best interests standard asks decision-makers to weigh expected benefits against expected burdens. On this view, parental choices are respected within a zone of parental discretion and overriding parental authority is justified only when the parental decision creates a substantial and immediate risk of serious harm, and when an alternative course of action is necessary to prevent that harm and is likely to be effective.