I'm gonna have to vote for number 4. He's giving a killer look straight into the camera. Actually I'd say he looks a little smug because he's so great with his momma. It's like he's saying "look what I've got".
I don't like 1 or 2 because he looks half starved so not very attractive. All the rest like 99% of new born photos the eyes are closed and so I think they're only good for the momma and poppa.
Do a search on Anne Geddes, she makes her millions from photographing babies.