16 weeks pregnant above the navel than below should be the cause of fetal position, when the fetal head or buttocks are located above the navel is manifested in the above stomach is slightly larger than below. Before the 30th week of pregnancy, because the head of the fetus has not entered the pelvis, the position of the fetus is often changed, and the head is larger than the trunk position during the fetal period. So basically the head is located in which part of the uterus, which part is a little more bulging, this is a normal phenomenon, do not need to be overly nervous. When the head of the fetus into the pelvis after the position no longer occurs big changes, the shape of the stomach is basically fixed, of course, there is excessive amniotic fluid pregnant women even after 30 weeks of pregnancy may still change. At 16 weeks of pregnancy, you need to pay attention to rest and observe the situation. If it is simply a matter of belly shape, it is usually not a big problem, but if it is accompanied by stomach pain, you need to consult a doctor in time for examination.