infanticide; filicide
Refers to the act of killing one's own child. A serious, legal/psychological term.
その事件は子殺しとして扱われた。
The case was treated as filicide.
子殺しは最も重い罪の一つだ。
Filicide is one of the most serious crimes.
Compound of 子 (child) and 殺し (killing), from the verb 殺す (to kill).