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Infanticide is the crime of killing a baby or a very young child. That is the sense you will meet in law, history, and news. In older or legal use it can also name the person who does it. It is a hard, formal word, not an everyday one, and it is grim on purpose: it does not mean hurt a child in a loose way, and it does not mean parenting. Though actually, scientists also use it for animals, when an adult kills young of its own kind; that is the same idea in biology, not a courtroom. You do not need this word for ordinary life. If you meet it, it is naming something specific and dark.
殺嬰（罪）
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
infanticidenoun詞源 1/ɪnˈfæntɪsaɪd/
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The murder of an infant.
- PROLICIDE […] Admits of two divisions, fœticide or criminal abortion and infanticide or the destruction of the new born infant.
- A recent government survey shows that 65 per cent of the families in Japan today are nuclear families, and a report on infanticide published this year by the Criminal Sience Club of Chuo University here indicates that eight out of ten infanticides today occur in nuclear families.
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The murder of a child by a parent; filicide.
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lawThe criminal offence of killing of a newborn, committed by its mother while psychologically disturbed by the effects of childbirth or lactation, not regarded as murder.
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biologynatural-scienceszoologyThe killing of a young, immature animal by a mature adult of the same species.
infanticidenoun詞源 2/ɪnˈfæntɪsaɪd/
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The murderer of a child: a person who has committed infanticide.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。