The infant mortality rate is calculated by dividing the number of infants who die within one year of birth by the number of infants who are born. The infant mortality rate is usually expressed as ...

However, mortality rates from Sudden Unexpected Infant Death (SUID) rose significantly -- by 11.8% -- from 2020 to 2022. Infant mortality in the United States decreased by 24.2% between 1999 and 2022.