Hiya.
Just a few comments for me... all my opinion though...
#1 - don't think you need all those extra bits in the background, less is more.
I'd also try to lighten up baby's right eye a touch.
#2 - Looks a bit flat, no real pop to it, but you can fix that in post. I'd have also tried to get round a bit more, facing baby.
#4 - Cut off baby's toes a tidge. Also doesn't look level; Anything with visible lines, either horizontal or vertical will stand out a mile if it's not straight. Your background vinyl is a bit wobbly as well. I might have tried to get some more distance between the kids and the background so you could throw it out a bit more. But you could probably tweak that in post and fix it.
#5 - Again, it's not level. Also, and this is just a thing that irks me personally, is seeing the soles of shoes.
On another note, I think your logo is a bit over-powering. I find it difficult to read with all the colours in it as well.
These are just my personal opinions though, I think they're a nice little set overall.