The figure shows the odds ratios of overweight at age 7 years with increasing numbers of cigarettes smoked daily during pregnancy by two different exposure periods, either exposure only during pregnancy, or exposure both during pregnancy and postnatally.

<p>The odds ratios were adjusted for child sex, parity, birth weight, gestational age at birth, maternal age at birth, maternal gestational weight gain, maternal pre-pregnancy BMI, paternal smoking and socio-occupational status.