Babies at 34 weeks of pregnancy usually weigh around 2.25kg and 45cm in length, depending on the development of different children. The size and orientation of the fetus can be observed by ultrasound. 34 weeks’ fetal biparietal diameter can be up to 8.4cm, femur length can be up to 6.6cm, and weight is about 2.25kg. In addition, fetal movement in the 34th week of pregnancy is usually 3 to 5 times per hour, and about 30 to 40 times in 12 hours is normal. Fetal heart rate is 110-160 beats per minute. In addition, you can also do fetal heart monitoring, fetal heart monitoring is mainly to look at contractions and fetal heart baseline variation, comprehensive evaluation of fetal growth and development. Pregnant women are advised to consult the doctor promptly if they are aware of any abnormalities or if abnormal fetal development is detected under ultrasound, and to take active treatment under the guidance of a professional obstetrician and gynecologist.