reasons kung bakit malaki ang baby: You have high blood sugar. You are more likely to have a big baby if you have diabetes before you become pregnant or develop gestational diabetes while you're pregnant. You are overweight before your pregnancy. You are more likely to have a big baby if you are overweight or obese before you become pregnant. You gain an excessive amount of weight during your pregnancy. What you eat during your pregnancy and how much weight you gain can affect your baby’s birth weight. You are having a boy. Boys typically weigh a little more than girls, and larger babies are often male. You have a family history of big babies. Sometimes it’s genetic. You are of advanced maternal age. You are more likely to have a big baby if you are pregnant over the age of 35. You consume too many processed carbohydrates. Studies have shown that eating high-glycemic carbohydrate foods can result in excessive growth of the fetus, maternal weight gain, and a likelihood of developing macrosomia.