Babies born in developing countries tend to be lighter at birth than babies born in more advantaged countries although within developing countries more affluent mothers have babies whose birthweights are similar to those of babies in the developed world. Emigration to a more advantaged country results in an increase in birthweights. Thus it has been estimated that the average birthweight of babies born in the UK to mothers born on the Indian subcontinent is about 300 g greater than that of babies born in India …