Preliminary U.S. data from the Centers for Disease Control and Prevention (CDC) show that infant mortality in 2025 reaches an all-time low. The rate is about 5.36 deaths per 1,000 live births, down from 5.54 in 2024 and 5.63 in 2023. Infant mortality counts deaths of children under one year of age, based on linked death and birth certificates. Sources describe the decline as statistically meaningful and note that it corresponds to hundreds fewer infant deaths per year, although exact totals may change as CDC analysis is completed.
The CDC data are also described as not yet available by state for the latest figure, while prior CDC reporting for 2024 showed large state-to-state variation, with Mississippi having the highest infant mortality rate and New Hampshire the lowest. The reporting emphasizes that while the United States continues to improve, its infant mortality rate still trails some other high-income countries. Researchers and other health reporting point to factors such as preterm birth, low birth weight, congenital conditions, sudden infant death syndrome, unintentional injuries, and pregnancy-related complications. Reporting also references additional preventive measures for respiratory syncytial virus (RSV) introduced in 2023.