In ALL of these photos, the eye sharpening is MUCH too overdone. No eye looks like that naturally and the result is FREAKY.
1) Overexposed. You can start to see it in the left shoulder, and the irises start to bleed into the retinas because the light from the iris is spilling over to the part of the sensor where the retina is being captured. I'd crop the left side a little more to de-center the head. Fill flash is required to get rid of the shadows on the face from the sun - especially the shadows being cast by whatever hair isn't plastered to his head by the water. Look into buying a Nikon Speedlight SB-400.
2) Centered head that fills the frame. Go use Google to educate yourself about composition, and about infant photography in general - a mouth agape is not a smile.
3) See #2. Also, before the shoot touch-up the blotch above the right eye.
4) Much too overexposed. Don't even see why you bothered to keep this one, much less post it - this is a throwaway. Needs more space on the left, see: composition.
5) DID I MENTION THE FREAKY EYES? GOD! Background is under-exposed. Just because there's a little pop-up flash on your camera does not give you license to create very hard shadows being cast underneath the arm and fingers onto the neck and shirt and completely underexpose the background. Again, see: composition.
6) These eyes would've been nicely done, with the light reflected in them, if they weren't CREEPY. Very harsh lighting is also evident here - it's almost dismissible in the previous photos but here? You can get better results with a point-and-shoot and a small amount of attention given to lighting. Also - does this kid have jaundice? Sure looks like it.
7) This is the best of the lot and would probably be a keeper if it wasn't for a) the eyes and b) the total lack of expression on his face. Don't forget that the only way I know that the background is water is because the little guy's wearing some kind of a swimsuit/life vest - too bad the water is completely blown out for me to be able to actually tell just by looking at it! You may want to Google and buy a circular polarizer filter.
8) Again, previous comments still apply and by now you should know which ones I mean! Particularly about harsh, direct flash right in her delicate face with a particularly asinine expression.
9) Let's see here: *pulls out laundry list* overexposed? Check. Needs fill-flash? Check. Composition problems? Check. And is that vignetting I see? You could get away with it in the previous ones but here - mmmmm no. Oh yeah I almost forgot - EYES. CREEPY.
I know, the eyes are REALLY starting to get to me. Did I mention the eyes?
Like others have said before me - it is the tough love that improves you work. Think I'm being too harsh? Learn from my criticism. Newbies need to learn what constitutes a keeper and what doesn't. I was once in the same position as you guys (my older posted work is horrible) and in fact, in many ways I am still a newbie myself. I probably missed some stuff here, and someone with more experience may dismiss some of my criticism as being idiotic. Take it for what I offer it.
But don't even think that what you have is considered acceptable for professional purposes. Just because you got yourself a soccer-mom DSLR doesn't mean you are a professional - it is a tool, much like a brush. And just like a brush, you can either make a few simple strokes and call your kindergartener's fridge-worthy piece a Picasso, or you can take your time, practice, learn, fail, succeed, try again, laugh, cry, pick yourself up, try again, and finally polish off something to be proud about.
To everyone who said that the above works had nothing wrong with them - once again, stay away from C&C threads. You're not helping the people who post the pictures, and you're not helping yourself. If you like the photos at hand for some reason or another and don't want to see them fall of the front page then bump the thread and let someone with more know-how come in and give a proper critique.