What's with all the praise? Are you related to the OP or something?
#1: Too much space on the top. Might look better with an 8x10 crop (right now it's 6:9, 4:5 would make it less tall). It's not as interesting as #2 but it's a similar shot so #2 kinda trumps it.
#2's a kick ass photo because of all the detail in the frosted window, the silhouette and the perfect framing. The square crop worked very well on this shot as well.
#3: Pacifiers shouldn't make it into photos.. makes this a snapshot in my opinion. Adding selective color to the binky only takes more value away from the photo.
#4: Nice moment captured, decent photo. I'd crop a little off the left and top and call it a day. The grass makes for a good background. The light is all over the place on this one. This shot would have benefited from some fill flash or a reflector of some sort (see the bright highlights vs shadowy areas on the face). I try to stay out of the direct sun when taking photos when I can help it.
#5: I agree with p!nk, weakest of the bunch. It's blurry and dark, skin tones are a bit green, visible diaper..
But #2 is really good.
I'm not trying to be overly harsh or anything, just trying to help.