Objective The objective of this study was to investigate the influence of maternal weight gain on birth weight of a population of newborns.

Patients and Methods Study including all patients who delivered in the service of the Maternity Hospital Provincial BENSLIMANE between 1 October 2010 and October 1, 2011. Three groups of patients were formed according to weight gain: less than 8kg, between 8 and 16kg and over 16kg normal. The epidemiological characteristics, obstetric complications and neonatal outcomes were analyzed. The survey is conducted on the basis of a questionnaire, for parturients and obstetric records analysis.

Results The mean birth weight was higher in the group “weight gain” ≥ 16 kg “(3782.9±595 g p<0.05) and the rate of newborns weighing more than 3800g (45.5%, p<0.05), unlike those weighing less than 2600g (hypotrophy) whose percentage was higher in the group “weight gain” < 8 kg (6.2% p<0.05), weight gain greater than 16 kg represented a risk factor for dystocia (34.7%).

Conclusion An excessive weight gain during pregnancy has deleterious effects on neonatal trophicity. It promotes macrosomia. These data point out the interest to follow the recommendations of weight gain during pregnancy.