No doubt from observation and imitation of the bi-pedal folks surrounding them. Without someone to model their behaviour upon [and I'm certainly not advocating any experiment to find out!!], I wonder how long, if ever they would take to get up on their feet.
I agree with you here, the evidence of feral children (see
Message 172) shows that this is a real concern for children up to ~6 years of age, for proper development to what we would recognize as
human behavior. Curiously this also appears to be near the horizon for easy learning of foreign languages.
This means that there is some nerve\brain\sensory development that is not fully complete in humans until this age barrier is passed, and that it needs some minimal level of stimulation to develop "normally" for humans.
Another criteria I have seen is that it takes until about 11 years old for a child to be able to be independent enough to develop on their own into a "normal" adult human (what we recognize as human).
Enjoy.
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