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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.