I LOVE the light and the B&W in the second shot...gorgeous neutral-tone B&W, lotta' snap! to it, lovely direction to the light, her eyes have big, strong catchlights. Minus: cropped off her sitter and left more headspace...cluttery background? Maybe, but it's REAL, and it's where you live, and it has the tricycle, some of the toys, and so on, so I look at it as being more of a documentary photo, rather than a posed shot. Shot #1 blowing bubbles is cute, but unremarkable, but again...documentary, shows the balcony, shows her real life. There's a balance between real, daily life documenting of things, and setting up "candid portrait opps"...there's a place for both. The third and fourth are what I mean by "candid portrait opps"...candid in the old sense of the word...the light has nice direction, which gives shapes, but the eyes go a bit dark with the chair positioned that way in relation to the window.
I dunno...I call this kid photography...when my son was little, I did a lot of it; it can be very challenging, and the child's world is messy, filled with clutter and stuff, fast-paced, short-timed, unpredictable, and occurs within two feet of the ground most of the time, which is what makes the backgrounds such a big issue: down that low, there is a LOT of stuff that gets into the background...no clean white walls to allow to drop to middle gray as with a 5'8 inch woman...nope...there's chair legs and dolls and throw pillows thrown on the floor and crackers and stuffed "aminals" and "Wego's!". But I still like to see that stuff if it fits into the reality. We have some people here who have elevated kid photography to a high level; I think one's kids are a subject well,well,well worth shooting for at least a decade.