Why is sweet potato good for pregnant women? Vitamin A in sweet potato is good for both, the mom-to-be and the developing baby. Half a cup of sweet potato is enough to meet the daily vitamin A dietary requirement of pregnant women. Contrary to popular opinion, it is not a starchy food when baked, since most of the starch is broken down to maltose and other soluble sugars. They rank as one of the healthiest vegetables, because of high levels of vitamin A, C, iron, potassium, and fibre.The high fibre as well as low carb content of sweet potatoes makes it a good alternative to potatoes in pregnant women with gestational diabetes.