Fetus has been small two weeks may be related to the wrong accounting of gestational weeks, malnutrition, disease, etc. It is recommended to recalculate the gestational weeks, enhance the nutrition, and treatment for diseases. 1. The wrong accounting of gestational weeks: the fetus has been small two weeks may be the pregnant woman’s own calculation of gestational weeks error, especially the menstrual cycle is not allowed to pregnant women, in the accounting of gestational cycle is prone to error. After correctly calculating the gestational weeks, you will find that the growth of the fetus is normal in size. 2. Malnutrition: Fetus has been small two weeks may be pregnant women with insufficient nutritional intake, some pregnant women do not want to eat after pregnancy due to gestational reactions, the daily intake of nutrients is insufficient, resulting in a long time the fetus is small. It is recommended that pregnant women should supplement nutrition in time, eat more, pay attention to the daily diet nutritional balance. 3. Disease: Fetus has been small for two weeks may be the influence of disease, such as suffering from abnormal placental development, blood circulation disorders, umbilical cord knot, or pregnant women have diabetes, viral infections lead to small fetus, need to clarify the cause of disease, targeted treatment to improve this abnormal phenomenon. Pregnant women are advised to go to regular hospitals in time when they find that their fetus has been small for two weeks.