@Override
public void render(MatrixStack matrixStackIn, IVertexBuilder bufferIn, int packedLightIn, int packedOverlayIn, float red, float green, float blue, float alpha) {
Body.render(matrixStackIn, bufferIn, packedLightIn, packedOverlayIn, red, green, blue, alpha);
}
In here, you overrode the AgeableModel's render method which contains the info for scaling child models.