Objective: The aim of the study was to investigate the influence of ethnicity and cerebroplacental ratio CPR on the birth weight BW of first generation Indo Pakistan immigrants' newborns.Methods: This was a retrospective study in a mixed population of 620 term Caucasian and Indo Pakistan pregnancies, evaluated in two reference hospitals of Spain and Italy. ...The influence of fetal gender, ethnicity, GA at delivery, CPR, maternal age, height, weight and parity on BW was evaluated by multivariable regression analysis.Results: Newborns of first generation Indo Pakistan immigrants were smaller than local Caucasian newborns mean BW mean 3048 435 g versus 3269 437 g, p