Adorable, indeed!!! MY favorites are the first, of her pointing, and the B&W shot with her walking and her mamma bent over and walking beside her,giving encouragement. As far as photographing kids on the move: elevate the ISO to 400 to 640, keep the lens set moderately wide-open, at around f/4.5 to f/5.6, and stay 20-30 feet away with a 70-200 or 70-300. That distance gives you reasonably easy focus with decent depth of field, AND forces you to use a long enough focal length that the background angle of view will always be somewhat narrow, which allows you to move just a short distance one way or the other to control background "issues". When shooting closer, at say 7 to 10 feet with wide-angle focal lengths, you will be forced to have wide-angle backgrounds, because the subtended angle of view of a wide-angle lens is.....wait for it...wide!!! And no, I am not kidding you with this advice...stay back a bit...keep the ISO higher...we're hoping for shutter speeds in the 1/500 or faster range, because you are going to be shooting on the fly, crouching, standing up, moving, working the situation, and you want to be able to zoom RIGHT IN, to maximum, 200 or 300mm, for beautiful close-up or detail type frames, of a moving kid...at f/4.8 to f/5.6, borderline shutter speeds like 1/200 will NOT cut it reliably.