Due to fat excess the visualization of the product is more difficult by the ultrasound. Due to fat excess is more much difficult to practice diagnosis by amniocentesis. The anesthetic technique will be more difficult to do it. The risk of surgical complication is higher. It's easier to get a wound infection.
Urinary infections are more frequent by ascendent via.
It's proven that the decision to end the pregnancy before time in the woman with Obesity depends on the factors mentioned above. It's very important to watch the nutritional, caloric and vitamin intake during the pregnancy, because an inadequate watching will bring problems to the mother and to the product. If you have any doubt with respect to this information consult your family doctor.