*shrug* I understand where she is coming from. Most newborns look the same to me. I can also understand a few of her other comments:
"Shiloh was more priveleged from birth"- People acted like it was the second coming when that baby was born. It's the child of Jolie and Pitt, considered the most attractive people in the world. (I know, not everyone thinks that about them, but a lot of people do.) The pictures of Shiloh sold for a couple million for crying out loud.
I think the above is the same reason that you don't see Shiloh out in public very much. The media frenzy over that baby is just insane. Mad and Z, as I've seen her refer to them... not so much. The paparazzi are crazy enough as it is too, so I can understand her need to keep Shiloh away from it a little bit. (The paps don't seem to be nearly as numerous when it's just her and Mad/Z.)
As far as "less inclination to feel for Shiloh" and "being nicer to the other two because they're vulnerable"... well, I can only imagine with Mad being school-age that he's been teased here and there. Hell, Shar Jackson who has two kids with Britney's ex, Kevin Federline, said her children were teased in school and asked, "Why did your daddy leave your mom for Britney Spears?" Who knows what other kids have said to them, especially because they don't look just like Mom and Dad. Kids can be cruel... I can imagine Mad and Z can see it too when the entire family goes out in public and the paparazzi swarm to get pictures of Shiloh... but not so much Mad and Z. Less inclination... well, again, I can understand. As others have said, it's got to be a challenge to have older adopted children and a younger biological child. While her comments might be weird for a mother... I think it's a whole different ballgame when you're talking about a celebrity couple like Pitt and Jolie.