The effect of supernormal size and strength on the age at which the onset of walking occurs has often been discussed, but no factual evidence relative to the question has ever been adduced. In that connection, the cases of most extreme development are probably the most important, since the greater in excess of normal is the bodily development of the child the greater might be expected to be its effect on the age at which walking begins.
The instances of most advanced physical growth in the first and second years of life are undoubtedly those rare cases in which puberty is attained during this period. It has been known since the time of Geoffroy-Saint-Hilaire that premature puberty is preceded and accompanied by an acceleration of skeletal development and of ossification. This is amply shown by the literature on precocious maturity. Smith, in 1822, reported the case of a boy who