A pregnant woman’s exposure to tobacco smoke and pollution from road traffic can influence the development of behavioral outcomes in early childhood. This is the conclusion of a recent study led by a team from the Barcelona Institute for Global Health (ISGlobal), a center supported by the “la Caixa” Foundation. The study, published in Environmental International, is the first to investigate the impact of the exposome—i.e. the set of all environmental exposures, both chemical and non-chemical, during the prenatal and postnatal stages—on child behavior. Previous research had assessed the impact of environmental exposures separately but not as a whole.