Аннотация:The study of fetal growth patterns and body parameter dynamics is an actual task of both human prenatal biology and obstetrics. The study aim is to identify the prenatal time of manifestation of sex differences in weight, body length, torso length, and BMI. The material ranging from 14 to 33 weeks was divided into two age groups: the second trimester group (N= 127) and the third trimester group (N= 112). The difference in the weight was detected already in the second trimester and was 72.4 grams. In the third trimester, the differences between two groups were 0.34 grams in weight. The BMI of both groups was the same. The obtained results indicate a decrease in the difference in weight by almost two times in the third trimester compared to the second trimester.
