Twin Pregnancy Cohort

The investigators know that multiple factors are involved in the risk of obstetric complications. The twin pregnancy model appears to be an interesting model for a bio-statistical analysis of data collected in the context of a complete pregnancy, in particular because it can reveal differences for a common exposure. The aim of the study is to constitute a prospective cohort of twin pregnancies. The collection of data on the health of mothers, pregnancies, childbirth, and the health of twins at birth should make it possible to reveal results with sufficient statistical power for a prospective study.