C&C per req:
1. This isn't a processing style of which I'm fond, but I recognize it's popular, and I think you've done a godo job, but I think just a slight saturation boost on the child would help.
2. Nice, however I think it should either include both feet or no feet. The part of the right foot in the image seems a little awkward to me.
3. How about a square crop?
4. Nice enough, but there's a lot of distracting background elements with all of the handrails (or whatever they are). I'm also not really sure that her expression is the best here, but if Mom likes it, that's all that counts. Good exposure.
Just my $00.02 worth - your mileage may vary.
~John