Fetal heart rate of 110~160 beats per minute is normal for 15 weeks baby, the value of fetal heart rate will be different in each pregnancy test, but within the normal range. Fifteen weeks pregnant is the middle stage of pregnancy, this time through the fetal heart monitor can understand the value of the fetal heart, the normal fetal heart rate of 110 ~ 160 beats / min, fetal heart occasionally high or low, the duration is relatively short is also a normal phenomenon. Fetal heart for more than 10 minutes below 110 beats / min or higher than 160 beats / min is not normal, may be the fetus intrauterine hypoxia, fetal cardiac development abnormalities, drug factors and other causes. After pregnancy, you should do a good job of maternity checkups during pregnancy, and start to do fetal heart monitoring checkups from 32 to 34 weeks of pregnancy to find out whether the value of the fetal heart is within the normal range, in order to determine whether there is any abnormality in the development of the fetus in the uterus.