The feeling of vibration in the stomach in the 4th month of pregnancy may be normal. A pregnant woman who is pregnant for the first time will feel normal fetal movement at about 18 weeks, and fetal movement is the activity of the fetus in the uterus.
Generally speaking, the phenomenon of fetal movement is roughly about 3 times to 5 times per hour, in 24 hours the phenomenon of fetal movement is in the 70 times to 120 times, these are normal, do not need to worry too much, the gestational week is small, the fetal movement is basically no regular, sometimes during the day, sometimes at night.
After the increase of gestational weeks, fetal movement is gradually regular, the general sleep cycle of the fetus is 20-40min, in the sleep cycle is generally reduced or disappeared fetal movement, wake cycle fetal movement will be more, pregnant women need to grasp the laws and characteristics of the fetus.
If you find that the fetal movement is too frequent, etc., you should consult a doctor in time to avoid intrauterine hypoxia and other conditions of the fetus.