We are descended from other ape species that also find babies cute. It they didn’t, we wouldn’t even exist. It wouldn’t surprise me if that’s pretty common among mammals in general, and if we had time machines I’m sure we would find that behavior in the first mammals.
Baby mammals all have things in common (such as relatively large eyes) that are perceived as “cute”, not just among humans. Since baby mammals almost always have this feature, it’s seen as cute among probably all mammal species.
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