Pregnancy 30 weeks fetal growth of one week may be normal, such as pregnant women over-nutrition, pregnancy week calculation error, etc., but also does not exclude pathological factors such as gestational diabetes caused by a huge child, etc., should pay attention to, this time you need to control the diet, recalculate the gestational week or control of blood glucose. 1. Excessive nutrition of pregnant women: If pregnant women consume too much nutrients during pregnancy, and fail to control their own weight to grow properly, the fetus will also absorb too much nutrients, which can lead to fetal growth of one week, at this time, should pay attention to diet control, moderate exercise, to prevent excessive weight growth. 2. Incorrect calculation of gestational weeks: If the pregnant woman is not pregnant before the menstrual cycle is not regular, leading to the pregnant woman to remember the wrong time of menstruation, less than one week of calculation, may also occur in 30 weeks of pregnancy found that the fetus is larger than one week of the occurrence of the situation, at this time should be verified gestational weeks after a comprehensive judgment. 3. Huge children: if the pregnant woman suffers from gestational diabetes, the fetus is in the mother’s high blood sugar caused by hyperinsulinemic environment for a long time, to promote protein, fat synthesis and inhibit lipolysis, resulting in excessive development of the carcass, thus appearing in 30 weeks of gestation fetus large one week of the occurrence of the situation, at this time should be controlled by blood glucose, if necessary, use of insulin and other glucose-lowering treatment. If a pregnant woman is 30 weeks pregnant with a large fetus for a week, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, the treatment of the cause.