[1.16.5] How to make Baby version of a mob after breeding?

Hi, I don't know much about Minecraft Mod programming, and I'm making a mod, I need to know how to scale the model from the adult version to the child version.

I'm currently doing the mod itself by Mcreator, and modeling by Blockbench.

The reproduction of this mob is done, the problem is, the child is the same size as the adult.

At first I would use two different models for this animal, but researching a little, I found that there is a way to scale the model.

I wanted to know how to do this.

Here below is the code.

Quote

@Override
        public AgeableEntity func_241840_a(ServerWorld serverWorld, AgeableEntity ageable) {
            CustomEntity retval = (CustomEntity) entity.create(serverWorld);
            retval.onInitialSpawn(serverWorld, serverWorld.getDifficultyForLocation(new BlockPos(retval.getPosition())), SpawnReason.BREEDING,
                    (ILivingEntityData) null, (CompoundNBT) null);
            return retval;
        }