At 15 weeks of pregnancy the baby is in the lower abdomen of the pregnant woman, which has already exceeded the pelvis, and the uterine fundus is about slightly below the position between the navel and the pubic symphysis when lying down. Fifteen weeks of pregnancy belongs to the middle stage of pregnancy, after 12 weeks of pregnancy the uterus will gradually exceed the pelvis, by the end of the 12th week the bottom of the uterus is in the position of 2-3 transverse fingers on the pubic symphysis, by the end of the 16th week of pregnancy the bottom of the uterus is located in the umbilicus between the umbilicus and the shame, so when you are pregnant at the end of the 15th week of pregnancy the bottom of the uterus is located in the position of slightly lower between the umbilicus and the shame. The mother of 15 weeks pregnant, should pay attention to dietary nutrition intake, to meet the growth and development of the fetus, try to avoid coitus, appropriate physical exercise, avoid prolonged sedentary or standing for a long time, easy to lead to lumbar pain, pay attention to regular maternity examination.