Infant homicides are classified as deaths purposefully inflicted by other persons on children less than one year old. Data on infant homicide are developed by the National Center for Health Statistics, drawn from death certificates recorded by local medical examiners or coroners and reported to the National Vital Statistics System. These records code infant deaths using the injury classification framework developed by the International Classification of Diseases (ICD) codes, 9th and 10th editions.
For more information about ICD codes see http://www.cdc.gov/nchs/data/dvs/icd10fct.pdf.
A small number of stillbirths may be incorrectly classified as infant homicides. Medical examiners usually will attribute a death to infanticide only when they can rule out other causes (i.e., autopsy evidence indicates that respiration had occurred, no evidence indicates death from natural causes, and circumstantial evidence is consistent with homicide). 
Child Trends. (2018). Infant homicide. Retrieved from https://www.childtrends.org/indicators/infant-homicide.
1. Hispanic infants may be of any race. Totals for white and black infants in this report do not include Hispanic infants.
2. Knight, B. (1976). Forensic problems in practice. IX. Infant deaths. The Practitioner, 217(1299), 444–448.