Changing the size of a mob with code

Hi! I'm making a dinosaur mod and I need the baby variants of the dinosaurs to be smaller.

The baby variants are separate entities, and I don't think I can make a smaller model in blockbench for every single dinosaur in the mod
I know there's a way to do it, but I cant figure out how to change the size of them with code.
I'm new to java, and I'm on 2023.2