Now what have we to say regarding these sexual differences in the case of children? During the age which we have defined as the first period of childhood, except in the matter of the genital organs, we can detect hardly any important bodily characters distinguishing the sexes. Still, even at this early age some differences have been recorded. Thus, the average weight of new-born girls is less than that of new-born boys, the figures given by Stratz[12] being, for boys, 3500 grams (7.7 lbs.); for girls, 3250 grams (7.15 lbs.). According to a very large number of measurements, the mean length of the new-born girl is somewhat less than that of the new-born boy, the difference amounting to nearly 1 cm. (2/5ths inch). Craniometric records, taken at the end of the first period of childhood, exhibit differences between the sexes; in general, the measurements show that the girl's head is smaller than the boy's in respect both of length and breadth. Further, dynamometric records, taken from children six years of age, have shown that the grasp in girls is less powerful than in boys. But if we except such differences as these, which relate rather to averages than to individuals, and which, moreover, are for the most part demonstrable only during the latter part of the first period of childhood, we find that, apart from the reproductive organs, very little difference between the sexes can be detected during the first years of life. Many investigators have been unable to confirm the assertion that even in the first year of life the hips are more powerfully developed in girls than in boys. Fehling,[13] however, declares that as early as the fifth month of intra-uterine life, sexual differences manifest themselves in the formation of the pelvis. However this may be, it is beyond question that during the earlier years of the first period of childhood the differences between the sexes are comparatively trifling. But towards the end of this period, sexual differentiation becomes more marked. According to Stratz, it is at this time that the characteristic form of the lower half of the body develops. The thighs and the hips of the young girl exhibit a somewhat more marked deposit of fat than is seen in the boy of the same age. To a lesser extent the same is true of the calves. It is often assumed that even in very early childhood the sexes can be distinguished by the formation of the face. The girl's face is said to be rounder and fuller than the boy's; the expression of countenance in the former, to be more bashful and modest. Stratz, however, urges in opposition to this view, with justice, in my opinion, that we have here to do only with the effects of individual educational influences, or perhaps with individual variations, from which no general conclusions can safely be drawn.