Disappearing seasonality in birthweight.

OBJECTIVES We estimated seasonality in birthweight over time and assessed how seasonality changed. METHODS We analyzed all full-term singletons (N = 8,268,693) born in South Korea in 1997-2014. We first pooled all years and regressed birthweight on birth season while flexibly controlling for a large set of covariates. We then repeated the analysis by… CONTINUE READING