Wiktionary
neonaticide
n. The murder of a newborn.
Wikipedia
Neonaticide
Neonaticide is the deliberate act of a parent murdering their own child during the first 24 hours of life. As a noun, the word "neonaticide" may also refer to anyone who practice or who have practiced this.
Neonaticide are relatively rare in developed countries, but most of these murders remain secret:
Parental infanticide is more commonly committed by fathers than mothers but vice versa for neonaticide.