Select the most appropriate one-word substitution for the given group of words.

Murder of a new-born child 

Infanticide

The most appropriate one-word substitution for "murder of a new-born child" is infanticide.

• Regicide is the murder of a king or queen.
• Homicide is the killing of one person by another.
• Fratricide is the killing of one's brother or sister.

The word infanticide comes from the Latin words "infans," meaning "child," and "caedere," meaning "to kill." Infanticide is the intentional killing of a child, especially a newborn. It is a serious crime in most countries, and it can be punishable by life in prison or even death.