Adjustments were made for maternal age, parity, year of delivery, gestational age at delivery, preeclampsia, and diabetes. RESULTS: The immigrant women had 206 g 95 CI 199 to 213 g lower mean offspring birthweight and 16 g 95 CI 14 to 18 g lower mean placental weight than Norwegian women. ...CONCLUSIONS: Immigrant mothers from Somalia, Afghanistan, and Iraq gave birth to infants and placentas with lower weight than Norwegian women. ...