II trimester.
At this time, the child sharply gains height and weight, and the uterus also grows rapidly. That is why, at 12-16 weeks, an attentive mother will see that the belly has already become noticeable. True, those around you will notice the woman’s new position at about 20 weeks, especially if she wears tight-fitting clothes.
III trimester.
By the beginning of the third trimester, pregnancy is no longer in doubt. The belly is clearly visible even if a woman wears loose clothing.
Sharp, round, different.
From approximately the second trimester of pregnancy, during each examination, the obstetrician-gynecologist determines the height of the uterine fundus and measures the abdominal circumference at the level of the navel. Why does the doctor so carefully monitor the enlargement of my mother’s tummy? The fact is that this is the easiest way to monitor the growth and development of the unborn baby.
One of the formulas for approximate estimation of fetal weight based on the height of the uterine fundus (UFHR):
child's weight (g) = VSDM (cm) x abdominal circumference (cm) ± 150-200 g.