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Not isolated to humans -- a chimpanzee troop will often kill the first-born of a female who joins the group:
I remember learning about this as an undergrad in Anthropology, back in the '70's.
Female competition in chimpanzees
Female chimpanzees exhibit exceptionally slow rates of reproduction and raise their offspring without direct paternal care. Therefore, their reproductive success depends critically on long-term access to high-quality food resources over a long lifespan. ...
www.ncbi.nlm.nih.gov
Intra-community infanticide in wild, eastern chimpanzees: a 24-year review - Primates
Infanticide is well documented in chimpanzees and various hypotheses have been proposed to explain this behavior. However, since infanticide by chimpanzees is relatively rare, it has thus far not been possible to thoroughly test these hypotheses. Here we present an analysis of the largest...
link.springer.com
I remember learning about this as an undergrad in Anthropology, back in the '70's.