The collection of nearly 100,000 births from 22 maternity hospitals in various French regions permitted to establish foetal growth curves for weight, height and head circumference. The 50th percentiles of weight at term obtained in this sample are not different from those given by Leroy and Lefort in the Paris region in 1971. However below 38 weeks of gestation, we found that 50th percentiles are 100 or 150 g less than those given by Leroy and Lefort. The discussion from international papers show large variations of the 10th percentile for weight in according to gestational age and sex, these variations are often related to the choice of different target populations.