In humans, infanticide is not as frequent as in animals. However:

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Studies have shown that men are more likely to commit infanticide if they suspect that the child is not biologically theirs. This suggests that men are sensitive to whether children are theirs or not, and may act aggressively towards non-biological offspring in order to ensure the survival and spread of their own genes. However, this does not mean that men are unable to feel affection for children that are not related to them, nor does it suggest that infanticide is a common occurrence among humans, as it is in some animal species.

In Humans, Infanticide Is Not as Frequent as in Animals