Neonatal death is the death of a baby within the first 28 days of life. In 2024, an estimated 2.3 million newborns died during this window worldwide, accounting for 47% of all deaths in children under five. Most neonatal deaths, roughly 75%, happen during the first week, and nearly half of those occur within the first 24 hours after birth.
How Neonatal Death Is Defined
The key distinction is that the baby must be born alive. A live birth means the baby showed at least one sign of life at delivery: voluntary muscle movement, a pulsating umbilical cord, or a heartbeat. If a baby is born showing signs of life but dies within 28 days, that is a neonatal death. If the baby never showed signs of life, it is classified as a stillbirth. This distinction matters for medical recordkeeping, legal documentation, and how families access bereavement support.
Neonatal death is further divided into two periods. Early neonatal death covers days zero through six. Late neonatal death covers days seven through 27. The causes and circumstances differ between these two windows, though the babies and mothers affected often share similar profiles: premature delivery, low birth weight, and limited prenatal care.
The Most Common Causes
Three broad categories account for the vast majority of neonatal deaths: complications of preterm birth, problems during labor and delivery, and infections.
Preterm birth (before 37 weeks) is the single largest contributor. Babies born too early often have lungs that aren’t ready to breathe on their own, difficulty regulating body temperature, and immature immune systems. Low birth weight, which overlaps heavily with prematurity, compounds these vulnerabilities. Survival depends heavily on the quality of care available immediately after delivery and in the days that follow.
Birth asphyxia, where the baby’s oxygen supply is interrupted during labor, is the second major cause. When oxygen flow is disrupted, the baby’s body initially redirects blood toward the brain and heart to protect them. But this protective mechanism has limits. If the oxygen deprivation lasts too long or is too severe, blood flow to the brain becomes compromised, causing neuronal damage. Without resuscitation, a baby experiencing severe asphyxia will stop breathing within minutes. Asphyxia-related deaths are considered a sensitive indicator of the quality of care during labor and delivery, because many of these deaths are preventable with skilled birth attendants and proper equipment.
Infections, particularly sepsis, are the third major cause and play a larger role in late neonatal deaths. Newborns can pick up infections from the birth canal during delivery or from the hospital environment afterward. Signs of neonatal sepsis are often subtle and nonspecific: the baby may become less active, feed poorly, have unstable body temperature, or develop breathing difficulties, seizures, or jaundice. In late-onset cases (after the first few days), bacteria commonly enter through medical devices like intravenous catheters, which is why premature babies requiring intensive care face elevated risk.
Birth defects and maternal pregnancy complications round out the leading causes, particularly in higher-income countries where preterm and asphyxia-related deaths have been substantially reduced.
Why the First Day Is the Most Dangerous
A baby’s first hours outside the womb represent the most dramatic physiological transition of their entire life. The lungs must inflate and begin exchanging oxygen for the first time. Blood circulation reroutes from the placental pathway to the lungs. Body temperature, previously regulated by the mother, must now be maintained independently. For a healthy, full-term baby, these transitions happen seamlessly. For a premature or compromised baby, any one of them can fail.
This is why nearly half of early neonatal deaths happen in the first 24 hours. The quality of care in the delivery room and the availability of neonatal intensive care are the most important factors determining whether a vulnerable baby survives this window. In settings with limited medical infrastructure, many of these deaths occur simply because resuscitation equipment or trained providers aren’t available.
Risk Factors That Increase the Likelihood
Certain pregnancies carry higher risk from the start. Fewer than seven prenatal visits is consistently associated with neonatal death, because conditions like preeclampsia, infections, and fetal growth problems go undetected and untreated. Prematurity and low birth weight are the strongest predictors, but these are often downstream consequences of maternal health issues rather than random events.
Maternal age at both extremes (very young and over 35) increases risk, as do chronic conditions like diabetes and hypertension. Inadequate nutrition during pregnancy contributes to low birth weight. Placental complications and infections during pregnancy can trigger preterm labor or compromise the baby’s oxygen supply during delivery.
Global Progress Has Stalled
The global under-five mortality rate dropped by more than half between 2000 and 2024, falling to 37.4 deaths per 1,000 live births. But that progress has slowed dramatically. Between 2015 and 2024, the rate of decline fell by more than half compared to the previous 15 years. The total number of under-five deaths has plateaued at roughly 4.8 to 4.9 million annually since 2022.
Neonatal deaths are a major reason for this stalling. While child deaths after the first month have responded well to interventions like vaccines and oral rehydration therapy, neonatal deaths require a different set of solutions: skilled birth attendants, functioning delivery rooms, neonatal intensive care, and consistent prenatal monitoring. These are harder to scale in low-resource settings. If current trends continue, more than 27 million children are projected to die before age five between 2025 and 2030, most from preventable causes.
What Families Experience After a Neonatal Loss
Losing a baby in the first weeks of life is a unique form of grief. Parents are often still physically recovering from birth, may be in a hospital surrounded by other families with healthy newborns, and can feel isolated because society sometimes minimizes the loss of a baby who lived only hours or days.
Hospitals with strong bereavement programs offer parents the chance to spend time with their baby, take photographs, and create keepsakes like hand and footprints or memory boxes. These options are always voluntary, but many parents later find them meaningful. Bereavement-trained staff coordinate care so that parents don’t have to repeatedly explain their situation to different providers. Partners are increasingly recognized as needing equal support, since their grief can be just as profound.
After discharge, families are typically connected with local and national support organizations that specialize in infant loss. Pastoral care is available for those who want it. When grief becomes complicated or prolonged, referral for psychological support is standard practice. The period following a neonatal death is also when parents receive information about what happened medically, which often includes a postmortem examination if the parents consent, to help explain the cause and inform decisions about future pregnancies.