Birth 16 days before the due date is not considered preterm. Pregnancy lasts about 280 days (40 weeks) from the first day of the last menstrual period, and can be divided into three stages: early pregnancy (<14 weeks), mid-pregnancy (14th to 27+6 weeks) and late pregnancy (28th week and beyond). Full-term labor occurs after 37 weeks of pregnancy, so if the fetus is born 16 days early, i.e., at 37+5 weeks of pregnancy, it is already full-term and is not considered preterm. After pregnancy, it is necessary to follow the doctor's instructions to take obstetric examinations on time, and from the middle of pregnancy to ensure nutritional balance of dietary nutrition to meet the needs of fetal growth and development. You can also maintain a moderate amount of physical exercise under the guidance of your doctor, such as walking and pregnancy yoga, which can control your weight during pregnancy, reduce the risk of labor and facilitate natural delivery.