已婚妇女一旦怀孕后,腹围的增长将随着妊娠月份的增加而逐渐增大。由于个体的差异及其它因素等,腹围增加的程度都会有所差别。在通常情况下,至妊娠中晚期的孕妇其脐部的腹围一般不超过95～100厘米。若孕妇的腹围增长过快,则多是不祥之兆——可能存在某些病理性变化,应引起孕妇及其家人的警惕,及时去医院检查,以免延误病情。多胎妊娠:妊娠中晚期子宫增大的程度与妊娠的月份明显不相符合,但腹围增大的速度仍表现为循序渐进,同时腹部压迫的症状较轻,腹围可超过100厘米;在腹部的不同部位听诊时,可听到不同速率的胎心音。多胎妊娠的主因有三个因素:(1)环境因素,如受精卵着床前子宫内温度低或缺氧,使胚胎发育迟缓而诱发多胎;(2)遗传因素,据统 Once married, the growth of the abdominal circumference will increase with the increase of the month of pregnancy. Due to individual differences and other factors, the extent of abdominal circumference will increase there will be differences. Under normal circumstances, to pregnant women in the second trimester of pregnancy umbilical abdominal circumference generally not more than 95 to 100 cm. If the abdominal circumference of pregnant women grows too fast, it is mostly ominous - there may be some pathological changes should be vigilant pregnant women and their families, promptly go to the hospital to check, so as not to delay the disease. Multiple pregnancy: the degree of uterine enlargement in the second trimester of pregnancy is obviously inconsistent with the month of pregnancy, but the rate of increase of the abdominal circumference still shows step by step, meanwhile the symptom of abdominal compression is light, the abdominal circumference can exceed 100 cm; in the abdomen Different parts of auscultation, you can hear different rates of fetal heart sound. The main causes of multiple pregnancy are three factors: (1) environmental factors, such as pre-implantation of the uterus fertilized egg temperature is low or hypoxia, so that embryonic development induced multiple births; (2) genetic factors, according to the system