5 months pregnant fetal movement suddenly frequent, may be abnormal. 1. abnormal: pregnant women during pregnancy must pay attention to observe the fetal movement, if the fetus suddenly appear fetal movement increased or decreased significantly, must go to the hospital in time to improve the examination in order to rule out the fetus whether intrauterine hypoxia may be. 2. Normal: In the fifth month of pregnancy, if the pregnant woman is in a state of hunger or has eaten too much sweet food and other reasons leading to elevated blood sugar, the outside world is noisy and so on, may lead to the fetus to appear violent fetal movement. This situation is normal, it is recommended that pregnant women should not be in a state of hunger for a long time, but also pay attention to not consume too much sweet food, try not to go to noisy places. Pregnant women should pay attention to regular checkups during pregnancy, and deal with any problems at any time. If the fetus appears to move significantly at any time, it must go to the hospital for a perfect checkup in order to exclude whether there is the possibility of intrauterine hypoxia.