One thing to watch is you lighting ratio, the light on #2 &3 is too flat and even across the face, try turning one of your lights down and adding a 1 or 2 stop light ratio from one side of the face to the other, This will look more natural and give more dimension to the portraits.
I like them but as stated above a few posts ago I think that the baby's eyes are a little too much. Other than that I like all the compositions and the use of lighting..
The babies eyes are that sharp due to the Nikon 60mm Micro lens. It's a very sharp lens. I'll take a look at the NEF file and see if I can tone it down. Thanks for the tips.