NE of the most important effects of undernutritionis what Jelliffe has called nutritional dwarfing.During crucial periods of growth inadequate nutrition may lead to stunting which cannot subsequently be rectified by the consumption of an adequate amount, or even by a super-abundance of food. This is one reason, though it is probably not the only reason, that the average stature of the adult population of Britain in the earlier years of this century, was smaller than it is now. Three independent measurements of British adults have all shown that there was a sudden rise of 1 5 cm in the height of men and 1 cm in the height of women bom between 1900 and 1910. This increase has been ascribed to the initiation of welfare services, with school meals, unemployment benefits etc. at that time.Another anthropometric measurement, which has the practical advantage that the age of the child is certainly known, is the birthweight of the newborn child. As with adult height the average birthweights of babies born into communities who suffer undernutrition, are lower than those of babies in better nourished communities. Probably this is attributable less to malnutrition of the mother during the course of pregnancy, than to past failure of the mother to attain the full potential of physique which her genetic structure would have allowed; because malnutrition in her own childhood retarded her growth.In the British Perinatal Survey, Baird and Thomson (1969) showed that low maternal height together with its associated low birthweight, is also associated with a high perinatal mortality. Regional differences in the height of adult women between north and south and between urban and rural districts are associated with corresponding differences in perinatal death-rates.In the years of the industrial depression, 1929-1933, there was a slight rise in perinatal mortality followed by a prewar recovery period from 1934-1940 when there was a slow but steady fall. Baird and Thomson attributed this fall to improvement in economic conditions and presumably to improving maternal nutrition and health at the time; but the fall might also have been influenced by the increase in mean stature of women born after 1910.During the period of wartime rationing, from 1940-1948, there occurred the steepest fall in the perinatal mortality that has ever been recorded. This fall occurring at a time of great social disruption was attributed to improved maternal nutrition during wartime rationing with its priorities for pregnant women. From 1948 to 1958 was a period when mortality remained stationary despite the institution of the National Health Service in 1948; but from 1958 to the present time there has been a steady fall. It is suggested that this fall corresponds to the entry of the cohort of girls born during the wartime period of improved nutrition into childbearing age. If this is true, the benefits conferred on newborn children by the enlightened food policy in wartime have extended to the succeeding generation; action initiated then is saving lives no...