Background-Maternal weight gain in pregnancy is positively associated with offspring body mass index (BMI) and obesity risk in childhood, but whether this increased risk extends into adulthood or results in increases in other cardiovascular risk factors such as elevated blood pressure (BP) is unclear. Methods and Results-We used a population-based birth cohort of 2432 individuals (50% male) born in Brisbane, Australia, between 1981 and 1983 to prospectively examine the association between maternal gestational weight gain (GWG) and offspring BMI and BP at 21 years. On average, each mother gained 14.8 kg (SD, 5.1 kg) during her pregnancy. At 21 years of age, offspring mean BMI, systolic BP, and diastolic BP were 24.2 kg/m 2 (SD, 4.9 kg/m 2 ), 116.4 mm Hg (SD, 14.5 mm Hg), and 67.7 mm Hg (SD, 8.5 mm Hg), respectively. Offspring BMI was on average 0.3 kg/m 2 (95% confidence interval, 0.1 to 0.4 kg/m 2 ) higher for each 0.1-kg/wk greater GWG after adjustment for potential confounding factors. Systolic BP also was greater (0.2 mm Hg per 0.1 kg; 95% confidence interval, Ϫ0.2 to 0.6) in offspring whose mothers had higher GWG. Although this association was not statistically significant, it was consistent in magnitude with the association of maternal GWG with offspring BMI and of offspring BMI with BP. Conclusions-Our findings show that greater GWG is associated with greater offspring BMI into early adulthood and that this may translate into higher systolic BP in offspring. Further large studies are required to confirm an effect of GWG on a range of offspring cardiovascular risk factors. Key Words: blood pressure Ⅲ cardiovascular diseases Ⅲ epidemiology Ⅲ obesity Ⅲ pregnancy Ⅲ young adult A number of studies have examined the association between maternal gestational weight gain (GWG) and later body mass index (BMI) or obesity in offspring, with all but one of them 1 finding an association between greater weight gain during pregnancy and greater mean BMI or increased risk of obesity in offspring. [2][3][4][5][6][7][8][9] In 2 studies able to adjust for potential confounding factors, this association appears to be robust to adjustment for indicators of socioeconomic position, maternal prepregnancy or early pregnancy BMI, and infant birth size. 3,4 In by far the largest study to date (a record linkage study of 165 130 children, currently published only in abstract form), the effect was modified by maternal prepregnancy BMI, with an effect only among underweight/normal weight mothers. 7 A recent study by Wrotniak and colleagues 8 based on a retrospective cohort study of 10 226 participants also found that the association between GWG and offspring overweight at 7 years of age was strongest for women who were underweight before pregnancy. However, other studies either have not examined this interaction or have had too little statistical power to detect it. 4
Clinical Perspective p 1727The majority of studies to date have examined associations with offspring BMI assessed in childhood or adolescence. From a public health persp...