Babies whose mothers drank alcohol and smoked after the first trimester of pregnancy had a twelvefold increased likelihood of dying from sudden infant death syndrome, compared with those without prenatal alcohol and tobacco exposure, researchers reported in The Lancet's EClinicalMedicine. The findings, based on data involving almost 12,000 pregnancies, also associated alcohol intake or smoking alone to fourfold and fivefold increased odds of SIDS, respectively.