Constant exercise makes both the mother and the fetus in a positive state. When the fetus matures, the fetus will secrete a hormone into the mother's blood, prompting the mother's pituitary gland to secrete oxytocin and launch uterine contractions for labor. This is what we often call "melon ripe and dilapidated". After labor, the fetus actively looks for the appropriate meridian line in the mother's pelvis to rush outward; the mother is calm after labor, and with the progress of labor, the fetus gradually drops under the promotion of bursts of uterine polarity and symmetry contraction and abdominal muscle contraction. When the fetal head reaches the pelvic floor, the fetus is smoothly delivered with the promotion of pelvic floor muscle contraction.
When the activity of pregnant women is reduced, the fetus lacks the power of passive movement given by the mother, so the fetus has poor initiative and cannot actively secrete hormones to the mother. Mother's lack of exercise, muscle lack of elasticity, a small amount of oxytocin is not enough to start contractions, so can't labor and cause prolonged pregnancy. In addition, prolonged pregnancy is also related to fetal adrenocortical function. The following conditions, such as anencephaly, hydrocephalus deformity, abnormal cephalic cavity relationship, or maternal age, estrogen / progesterone imbalance, genetic and other factors are likely to lead to prolonged pregnancy. Its incidence is about 5% - 12% of the total number of pregnancies.
What should we do when the due date is up
Many pregnant women will encounter this situation, after the due date, the baby still does not move. In fact, it is normal to give birth within two weeks before and after the due date. If the baby is born between 24-36 weeks of pregnancy, it will be considered premature. If the baby is born after 42 weeks, it will be considered overdue.
If the pregnant woman has passed the due date of delivery, but has not yet appeared signs of delivery, we must pay attention to the following points:
1. Don't be too nervous, pay attention to fetal movement. Once the fetal movement is less than 3 times per hour or less than 20 times within 12 hours or the fetal movement is weakened, you need to go to the hospital for further examination immediately. The doctor will decide the time of delivery according to the situation.
2. Continue the prenatal examination, and give the results of early pregnancy examination (such as B-ultrasound, blood test, pregnancy test, etc.) and the time and results of fetal movement to the doctor, so that the doctor can check the gestational age again.
3. Strengthen prenatal examination, shorten the interval of examination, get in touch with the doctor at any time, inform the intrauterine fetal movement, and follow up the amniotic fluid volume by B-ultrasound. If there is no abnormality, the pregnancy can be continued under close monitoring.
If the expected date of delivery is delayed to 14 days, when the clinical so-called overdue pregnancy is reached, the placenta of some pregnant women will appear aging, and the fetus will appear anoxia and asphyxia, so the harm to the child is great, so we should go to the hospital in time to take measures.
The main methods are as follows:
Method 1: if there is no movement after the due date, expectant mothers should strengthen exercise. Upright movement can promote the fetus into the basin, but also exercise pelvic floor muscles, increase productivity. However, when you go out for sports, you need to find a 'bodyguard' in case of an 'emergency'.
1) Walking is the most suitable way of exercise in late pregnancy. Walking can breathe fresh air. At the end of pregnancy, walking can help the fetus descend into the basin, relax pelvic ligaments and prepare for delivery. When walking, you should talk with your child and listen to the singing of birds and the sound of crickets.
2) Prenatal gymnastics is very popular in foreign countries, gymnastics can not only promote the fetal head into the basin, but also increase the toughness and elasticity of pelvic floor muscles.
3) It's often heard that doctors say to expectant mothers who have passed the due date and haven't moved: "go and climb the stairs!" climbing the stairs can exercise the muscles of thighs and buttocks, help the fetus enter the basin, and make the first stage of labor come as soon as possible.
Method 2: drug delivery. Before drug delivery, a series of examinations and monitoring are required to evaluate the fetal condition and placental function, so as to make a decision. If it is found that the fetus is too large by ultrasound or the neck is quite soft by digital diagnosis, we can consider giving birth earlier. If cervical maturity is good, placental function is good, amniotic fluid volume is normal, you can wait for a period of time.
Method 3: B ultrasound examination. Due date has not been born after the B ultrasound examination, there are several key indexes.
1) Placental maturity. The maturity of placenta can be divided into first degree, second degree and third degree. If the maturity of placenta has reached the third degree, it indicates that the placenta is aging and can not provide the oxygen and nutrition needed by the fetus. Drug delivery should be considered.
2) Amniotic fluid volume. On two vertical ultrasound planes, at least one amniotic cavity must be larger than 1 cm in diameter. If the volume of amniotic fluid is too small, termination of pregnancy should be considered.
3) Fetal size. Prolonged fetal distress or increased chance of dystocia.
4) Umbilical cord blood flow velocity: the use of color Doppler ultrasound can measure the umbilical cord blood flow velocity, reflecting the size of blood flow resistance. In normal pregnancy, the resistance decreases with the increase of weeks, but if it is combined with fetal growth retardation or placental dysfunction, it will show abnormal changes. At this point, we should consider drug delivery.
What harm does it do if the due date is up
Generally more than the expected delivery period of 1 week, that is, 41 weeks of pregnancy, the doctor will recommend that pregnant women hospitalized, according to the situation of pregnant women's cervix. If the fetus has intrauterine distress, macrosomia, fetal head cross shame sign positive, the doctor will recommend cesarean section to end the delivery, to ensure the health of mother and baby.
If the fetus is normal, just simply expired, the doctor will according to the situation of the cervix to induce labor, promote the mother's cervical ripening, and cause spontaneous uterine contraction and labor. There is no difference between the delivery process after labor and natural labor, and the progress of labor process is the same, but the doctor will pay more attention to the observation of fetal tolerance to uterine contraction in the uterus, find fetal abnormalities in time, and deal with them in time.
Due to the continuous growth of the overdue fetus, the mother's placental function will be weakened, and the fetus will consume its own fat. Therefore, the born overdue baby has many wrinkles, like a little old man, and its immune resistance is not as good as that of the full-term baby.
Therefore, in order to prevent pregnancy expired, pregnant women should develop good living habits, eat a balanced diet, exercise properly, maintain a good attitude, regular prenatal examination, and deal with fetal abnormalities immediately. When there is no feeling near the due date of delivery, pregnant women can massage the nipple by themselves. This kind of massage can promote the pituitary gland to secrete oxytocin and cause uterine contraction. Generally, 20 minutes in the morning and 20 minutes in the afternoon can promote early labor through nipple stimulation.
How to avoid not being born when the due date is up
1. In the first half of pregnancy, women should timely record each menstrual cycle, in order to be able to calculate a more accurate due date. Two months after menopause, they should go to the hospital for examination, and then have regular prenatal examination, especially at least once a week after 37 weeks of gestation.
2. If the expected delivery period is more than a week and there is no sign of delivery, we should actively check, let the doctor according to the fetal size, amniotic fluid, determination of placental function, fetal maturity or through B ultrasound to diagnose whether the pregnancy is overdue.
3. Pregnant women can also self-test fetal movement. If the number of fetal movements within 12 hours is less than 20, it means that the fetus is abnormal; if the number is less than 10, it means that the fetus is very dangerous, so they should seek medical advice immediately. If the diagnosis is delayed pregnancy, the doctor should induce labor in time.
4. Often pay attention to the situation of the fetus in the abdomen. If there is no sign of delivery after 42 weeks of pregnancy, go to the hospital in time to ask the doctor to help end the delivery.