A pregnant woman’s stomach suddenly getting bigger within a few seconds is often related to a slight intestinal distension after peristalsis, or a change in the position of the fetus after fetal movement, and if it is not accompanied by other special circumstances, it generally does not need to be dealt with. If a pregnant woman’s stomach feels suddenly bigger within a few seconds, but there are no obvious symptoms of abdominal distension or pain, not to mention nausea and vomiting, there is generally no problem. In this case, pay attention to keep warm, pay attention to the diet structure, do not eat too much at a time, observation can be. There are also pregnant women who are pregnant itself after the abdomen is gradually bulging, and because of psychological factors and feel a sudden change in a few seconds is relatively large, in fact, there is no obvious change, as long as there are no other special circumstances, there is no need to deal with, regular and good maternity examination can be.