Occasional stomach bulging is usually normal for women at 16 weeks of pregnancy. Some thin women may feel a bulge in their stomachs during the 16th week of pregnancy due to irregular uterine contractions. This bulging phenomenon usually lasts for a short period of time and is not accompanied by obvious discomfort, and will decrease or disappear if you take proper rest. Some women in the 16th week of pregnancy has begun to feel the fetal movement, in the fetal movement, the fetal arms and legs impact to the female belly will see the phenomenon of bulging. Fetal movement is a normal physiological phenomenon and does not require special treatment. If the pregnant woman in the belly bulge, appear very obvious abdominal pain or vaginal bleeding and other abnormal phenomena, should consult a doctor in a timely manner, under the guidance of the doctor in order to clarify its specific causes, and give targeted treatment.