Predators everywhere target juveniles, and there is no reason dinosaurs were an exception — the bite marks and stomach contents say they were not.

Palaeontologist and reader in zoology at Queen Mary University of London

But this is the absolute rule of thumb for how foraging and growth and predation operate across everything from fish to starfish, praying mantises, all the way up to things like big cats via stuff like crocodiles. It's how it works. So it'd be very weird if it didn't also operate for dinosaurs. And then, as I say, we've actually got the direct evidence for this from bite marks and stomach contents. They're taking small stuff.