Demographic influence on maternal weight gain during pregnancy: where will we end up?

Maternal obesity is one of the most commonly occurring risk factors in obstetrics. Complications, such as gestational diabetes, venous thromboembolism, preeclampsia and many more, exist far more often in obese women than in pregnant women of normal weight.

Changes in maternal weight gain during pregnancy were analysed in Schleswig-Holstein between 1995 and 1997 and between 2004 and 2009. Between 1995 and 1997 data were drawn from 74,000 singleton pregnancies and between 2004 and 2009 from 118,000 pregnancies. The data centre of the University of Rostock performed the statistical analysis.

Maternal weight at the time of first consultation with proof of pregnancy was 67.6 kg in 1995 and increased to 70.7 kg in 2009. This means an absolute difference of 3.1 kg. Maternal weight at the time of delivery changed from 80.8 to 84.9 kg in the same period. This is an absolute difference of 4.1 kg. Body weight is higher in 2009 than in 1995 across nearly all age groups. Even in younger women (aged 17 years and over) differences in weight can be registered. The obesity rate (BMI ≥ 30) in relation to maternal age was also analysed. In general, the rate of obesity is higher in 2009 than in 1995 across all age groups.

These results show an increase in maternal weight gain during pregnancy over the last decades. However, the change in maternal weight is not dependent upon maternal age. The weight differences are consistent across nearly all age groups. Thus, age is not a risk factor for overweight and obesity.