TY - JOUR T1 - Snus in pregnancy and infant birth size: a mother–child birth cohort study JF - ERJ Open Research JO - erjor DO - 10.1183/23120541.00255-2019 VL - 5 IS - 4 SP - 00255-2019 AU - Ina Kreyberg AU - Katarina Hilde AU - Karen Eline S. Bains AU - Kai-Håkon Carlsen AU - Berit Granum AU - Guttorm Haugen AU - Gunilla Hedlin AU - Christine M. Jonassen AU - Live S. Nordhagen AU - Björn Nordlund AU - Corina S. Rueegg AU - Katrine D. Sjøborg AU - Håvard O. Skjerven AU - Anne C. Staff AU - Riyas Vettukattil AU - Karin C. Lødrup Carlsen AU - the PreventADALL Study Group Y1 - 2019/10/01 UR - http://openres.ersjournals.com/content/5/4/00255-2019.abstract N2 - Rationale While recent studies show that maternal use of snus during pregnancy is increasing, the potential effects on infant birth size is less investigated, with conflicting results.Objectives We aimed to determine if maternal use of snus during pregnancy influences the infant anthropometric and proportional size measures at birth.Methods In 2313 mother–child pairs from the population-based, mother–child birth cohort PreventADALL (Preventing Atopic Dermatitis and ALLergies) in Norway and Sweden, we assessed nicotine exposure by electronic questionnaire(s) at 18 and 34 weeks of pregnancy, and anthropometric measurements at birth. Associations between snus exposure and birth size outcomes were analysed by general linear regression.Results Birthweight was not significantly different in infants exposed to snus in general, and up to 18 weeks of pregnancy in particular, when adjusting for relevant confounders including maternal age, gestational age at birth, pre-pregnancy body mass index, parity, fetal sex and maternal gestational weight gain up to 18 weeks. We found no significant effect of snus use on the other anthropometric or proportional size measures in multivariable linear regression models. Most women stopped snus use in early pregnancy.Conclusion Exposure to snus use in early pregnancy, with most women stopping when knowing about their pregnancy, was not associated with birth size. We were unable to conclude on effects of continued snus use during pregnancy because of lack of exposure in our cohort.Snus use in pregnancy, reported by 7.1% of 2313 women, was not associated with infant birth size. As most women stopped snus use by 6 weeks gestational age, it was not possible to assess potential birth size effects of persistent use during pregnancy. http://bit.ly/2IG8Vnk ER -