infanticide -
The murder of a child by a parent; filicide.
infanticide -
The murderer of a child: a person who has committed infanticide.
infanticide -
The killing of a young, immature animal by a mature adult of the same species.
Wikipedia
Infanticide is the homicide of an infant; it can describe what might amount to a cultural act or an offence defined by the victim's age. Often it is the mother who commits the act, but criminology recognizes various forms of non-maternal child murder. In many past societies, certain forms of infanticide were considered permissible.