 The study found that different weight gain trajectories exist depending on a woman's pre-pregnancy body mass index, BMI, and other factors such as parity in age. Underweight, Normal Weight, Overweight, and obese women who gain between 8.4kg and 11.1kg, 6.4kg to 9.1kg, 3.8kg to 6.5kg, and less than 1.9kg at 30 weeks of gestation are on track to meet the new guidelines at 40 weeks of gestation. This information can be useful for pregnant women to monitor their weight during pregnancy. This article was authored by Naho Morisaki, Oralee Piedwijk, C.H.I.G. Morakuma, and others.