[Differential physical growth during the first years of life. III. Body composition]. / Crecimiento físico diferencial durante el primer años de vida. III. Composición corporal.

The present article report the results of longitudinally research, on growth children, of both sex and ages from 0 to 1 year of extrauterine life. We obtained measures that appraisal the muscular and fat tissues: upper arm and leg circumferences; muscle and fat of upper arm areas; triceps, subscapular and supra-iliac skinfolds. Moreover, we report relationship dates between weight and stature, which is a good indicator for morphological body equilibrium.

[Differential physical growth during the 1st year of life. II. Growth of the head]. / Crecimiento físico diferencial durante el primer año de vida. II. Crecimiento de la cabeza.

The corporal segment that display the major growth velocity before and after born is the head; that is, once a baby is born, it represents the fourth part of the stature, it has the greater corporal circumference, and their development is superior than other corporal segments. However, the growth shape of the craniofacial structures is different; so, the growth gradient of brain, is the responsible of the morphological view described previously; the facial structures follow the general growth curve; moreover, the facial bone that contributes with the growth of brain, describes mixed growth gradients. This complex shape of the head growth, requires the existence of growth standards for these structures. The present paper describes the results of longitudinal research on head growth. We studied 200 children of both sex and ages from 0 to 1 year of extrauterine life. We got 18 growth measures of the head, such as: head circumference, head length and width, minimum frontal diameter; head, total facial, upper facial, and nose height; bizygomatic, bigonial, external bipalpebral, internal bipalpebral and nose widths; length and width of lips and ear. Moreover, we report the final increments and the differences on sexual dimorphism.

[Differential physical growth during the first year of life. I. Body growth]. / Crecimiento físico diferencial durante el primer año de vida. I. Crecimiento del cuerpo.

Keeping up to date the children growth and development standards, it is a necessity of main order for Health Secretary, because of it is possible an adequate pediatric evaluation. The present study, reports the results of a longitudinal research on growth in children of both sexes and ages from 0 to 1 year of extrauterine life. In all, we got 44 growth measures of the body, head and corporal composition. This report describes the shape of growth body, illustrates the general parameters of growth: stature and weight. Also it includes the dates correspondent to corporal segment growth: sitting height, upper and lower segments; upper extremity, upper arm, lower arm, hand, lower extremity, thigh, leg and foot lengths; ankle height; biacromial, bicrestal, thorax, elbow, wrist, hand, knee, ankle and foot breadths; and thorax depth. Moreover, we report the final increments for corporal segments studied, and the differences on sexual dimorphism. We describe the methodology, socioeconomic and cultural custom results. The sample was classificated within middle lower social class.