You're getting there! Not too bad for a first effort. You got good advice from the people above. Cute kid! The farther away you can get the subject from the background, the easier it is to make the background well out-of-focus. But to do that on fake flooring and a fake baseboard, you need to build a set that's probably a bit bigger than what you have (I am guessing). The wider the set is, and the farther the flooring comes out away from the wall and toward the camera, the more posing flexibility you have, and the child has as well...if you're working on a narrow, small set, then everything has to be "just so" before "issues" pop up, like running out of flooring, or running out of background, or the child crawling and botching the shot because the background is soooo narrow that he MUST remain in location "X".
Still, I think yer doin' okay. Esp. for your first-ever shoot doing it this way!