Obesity is an increasing condition spreading out in all of the world, independently by race, sex and age. Obesity in pregnancy represent a risk condition for both mother and her offspring. All of the studies are observational and show intervention strategies on weight gain improvement during gestational period, a current topic, but still controversial. Our study is based on nutritional dynamic monitoring during pregnancy in order to improve health and wellbeing status of both mother and her offspring, through an early and efficacy prevention.