Women with big babies are more likely to have a cesarean section or to hemorrhage during birth. Bigger babies also have a greater chance of getting stuck in the birth canal during delivery.
According to Black, overweight and obese women who are considering getting pregnant should talk to their doctors about steps they can take to get closer to a healthy weight. In the U.S., two out of three women of reproductive age are overweight and one in four are obese, the March of Dime reports. 
"If you're already pregnant, you have to really, very seriously monitor your weight-gain over your pregnancy," Black said. "I wouldn't use the word 'diet,' because you need a certain nutrition and caloric intake for the fetus to grow."
As you prepare for your hopeful VBAC, has your doctor expressed any concern about how much you should/shouldn't gain during your pregnancy? Was baby's size a determining factor in your previous c-section(s)?