This was a prospective bi-centric study, exposed-unexposed. In an effort to better understand the potential independent effect of maternal obesity on fetal growth, investigators designed a prospective study, comparing fetal growth between normal weight (18.5 ≤ BMI < 25 kg/m2) or obese pregnant women (BMI ≥ 30 kg/m2), while maternal diabetes and hyperglycaemia was screened and treated throughout pregnancy.