The separate and combined effect of covariates on the odds ratio of low birth weight, small for gestational age and preterm birth during the two study periods, before and after October 6^th 2008.

αSGA is inherently adjusted for infant's sex. *Odds ratio adjusted for seasonal variation, maternal age and parity. **Odds ratio adjusted for seasonal variation, maternal age, parity, sex, diabetes and hypertension. ***Odds ratio adjusted for seasonal variation, maternal age, parity, sex, diabetes, hypertension, relationship status, place of residency and employment status.