Instead of losing weight in the last month of late pregnancy, it may be caused by a decrease in diet, changes in clothing, and the effects of illness. 1. Diet reduction: late pregnancy due to fetal enlargement, the uterus for the upper abdomen of the pressure is more serious. Due to the pressure on the stomach, pregnant women are more likely to have a feeling of fullness, pregnant women intake of diet is reduced, the weight is reduced. 2. Clothing changes: If you wear thick clothes before and thin clothes afterward when you measure your weight, it may also lead to weight loss due to the influence of clothing. 3. Influence of illness: If a pregnant woman has a wasting disease, such as hyperthyroidism, she may also become thin. If the pregnant woman has gastrointestinal diseases, such as gastritis, gastric ulcer, etc., leading to digestive dysfunction, it will also affect the weight. If a pregnant woman loses weight significantly in late pregnancy, she needs to seek timely medical examination to clarify the cause and target treatment.