How many months does fetal movement become normal? Can frequent fetal movements cause harm to pregnant women?

About 8 weeks after pregnancy, the fetus squirms in the uterus, which can be observed by B-ultrasound, but at this time, the fetal movement is too light for pregnant women to feel for the time being. But with the increase of pregnancy, the fetus is getting bigger and bigger, and the fetal movement will be much more obvious. By the end of pregnancy 16-20 weeks, pregnant women will gradually feel fetal movement, but each pregnant woman feels differently, and the fetal development is different, and the feeling time of fetal movement will be advanced or delayed. Many pregnant women think that frequent fetal movements also indicate that the baby is more lively, but the doctor reminds everyone that it may be that the baby lacks security. If babies don't get enough nutrition, they will keep protesting because of hunger. Therefore, if pregnant women find fetal movement in the middle of the night, it is recommended to supplement food, because this may be a sign of malnutrition.