Some of you might have the perception that all fruits are rich in nutrients that will not cause weight gain. Eating lots of fruits might even help give your newborn a healthy complexion. However, in addition to the 90% of water, fruits also contain glucose, fructose, sucrose and vitamins. These sugars are easily digestible, and fructose and glucose can be converted to triglycerides, a type of fat that easily leads to weight gain and high blood cholesterol. Thus, expectant mothers should eat no more than 300 grams of fruits per day.