Steve Wylie Offline Upload & Sell: Off
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To track focus on a moving subject with a Canon camera, you can set it to AI Servo, but I doubt that that is your problem. I agree with the others that it's probably a combination of too shallow depth of field (solution, use a higher f stop to increase it) and a too slow shutter speed. You say you like bokeh, which typically improves with a wider aperture and shallower depth of field, so there will be some trade-offs between your desire for out of focus backgrounds and the need to keep everyone in focus. In these cases, you can't afford to have a blurry kid, so sacrifice bokeh for depth of field. For the fast-moving child alone, I'd wager that your shutter speed is simply too slow. In these cases, with only one subject, a shallower depth of field (lower f/stop) will automatically give you faster shutter speed (to get the same exposure), and the AI Servo setting should track the child easily.
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