We aimed to investigate the associations of neonatal 25-hydroxyvitamin D (25(OH)D) and vitamin D-binding protein (DBP) and their corresponding genetic predictors with asthma risk.<h4>Methods</h4>We conducted a population-based cohort study of a random sample of individuals born in Denmark during 1991-2005 from the iPSYCH2012 study. Here, DBP is linked to asthma.