Women with obesity should not gain any weight until mid-pregnancy or later.

The current gestational weight-gain guidelines by the Institute of Medicine do not recommend lower targets for women with more severe degrees of obesity, citing a lack of sufficient data regarding short-term and long-term maternal and newborn outcomes. This new study provides data that have the potential to aid in the development of national reference values for optimal gestational weight gain for pregnancy among women who have higher classes of obesity including class II obesity (BMI 35-39.9) and class III obesity (BMI >40).
Dr.Hutcheon said, "Monitoring weight gain during pregnancy is key for optimal outcomes, and this is the first time we've had a glimpse of reference points for women with class II and class III obesity. With these data, we are a step closer to developing a more comprehensive understanding of safe and healthy levels of weight gain for women with different classes of obesity during pregnancy."
The research is published in 'Obesity'.
Source-Medindia