Putting One Foot In Front Of The Other

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Hannah started taking her first steps two months ago, but really only walked in short spurts, and still preferred to crawl or hold on to something while walking. Then yesterday, out of the clear blue sky, she seemed to decide that it would be much easier just to walk around. So she just started walking around all over the place, and hasn't stopped since. I wonder what clicked in her brain to make this happen?