C&C per req:
1. The lighting isn't bad here, but a reflector to bring a little light into her eyes would have helped. I'm NOT fond of the crop however. Bisecting limbs is not a bad thing, but do it boldly, and never at joints and NEVER, EVER laterally (as in the left arm).
2. Cute, but I think a broader crop would have worked much better. I would like to see at least some of her right arm. Nice lighting, but brighter catch-lights would be nice.
3. Again, too tightly cropped for my taste. As per #1 on cropping limbs.
4. Cute, but I would prefer to have her looking more toward the camera. If you're using Mom/Dad to attract the child's attention, always have them stand directly behind you, not off to the side. Looks like the key light was a touch hon on this one. Try and get down to the child's eye-level.
Just my $00.02 Worth - your mileage may vary.
~John