The obesity in Europe is established for 15-20% of population. About 20% of women in reproductive age have accrued body weight. Obesity in this group leads to increased obstetrical risk. Preconceptional normalization of body mass is crucial. Bariatric surgery is one of the most effective methods of obesity treatment with Roux en Y gastric by pass (RYGB) as the one of its kind. In this report we present tree cases of pregnancy and delivery after RYGB.