This page suggests that Aboriginal Australians commited high rates of infanticide, however this was mostly reported on as a reasoning for the stolen generation and was not anywhere near as common as many old sources suggest. Modern sources such as [1] say that "What was, in all likelihood, an exceptional and incidental practice amongst Aboriginal people, rather than a matter of common custom, was raised up by the interaction of European and Aboriginal fears of the other into a morally and racially defining trope that marked whole communities as ‘infanticidal’, and as people whose common rights could be morally suspended." – Unsigned comment, made some time before 12:49, 15 May 2022
References
A word of evidence: shared tales about infanticide and others-not-us in colonial Victoria by Marguerita Stephens in Part 4 of Creating White Australia