Fetal development
This week, the baby is about 50cm long and weighs about 3500g g, with an average biparietal diameter of 9.28±0.50cm, an average abdominal circumference of 31.49 2.79 cm and a femur length of 7.4±0.53cm.
40 weeks is the time when the fetus is born, so the internal organs and nervous system of the fetus are sound, the hands and feet are muscular and energetic, and the development of brain cells is basically stereotyped. The fetal chest will become more prominent, and the fetal liver will naturally become larger because of its special role in erythropoiesis.
Most babies will see their mothers this week, but this is not absolute. It is normal to advance three weeks or postpone two weeks. According to statistics, only 5% of babies can be born accurately at the expected date of delivery.
But don't expect a newborn baby to be as cute as a doll. The newborn's head is usually temporarily deformed (caused by squeezing when passing through the birth canal), covered with fetal fat and blood, and may have uneven skin color, birthmark or rash. These phenomena are normal. A few days after the baby is born, it will become a pink sculpture, cute and invincible!
1 Mama changed
40 weeks pregnant, your baby is likely to meet you this week. At this time, your weight has increased by about 1 1.7kg, and the height of your uterus has increased to 30-34 cm. At this time, the baby's position in your abdomen has been declining, and the protruding part of the abdomen has been slightly reduced.
Now you must be waiting for the arrival of the baby nervously and excitedly. Please stay calm and happy. Maybe one day this week or next week, you will feel bouts of persistent abdominal pain. When the pain becomes longer, stronger and more concentrated, then you may have to give birth. Once the interval between labor pains is less than 30 minutes, you should be admitted to hospital immediately to prepare for labor.
It is normal for a baby to be born within two weeks before or after the due date. However, if there is still no sign of labor after two weeks' delay, the expectant mother needs to go to the hospital to see if it is necessary to take measures such as induced labor to give birth to the baby as soon as possible, otherwise the fetus will be too mature.
2 prospective parents must read.
1, not ready for the bag: 40 weeks pregnant, you must get everything ready for the baby. First of all, we must prepare birth certificates, health books, medical insurance cards and other admission documents; There are loose clothes, underwear, pads, slippers and other small items; Small snacks are indispensable during childbirth, and chocolate is rich in nutrition. Eating during labor helps to shorten the labor process and prepare more pieces. In addition, bottles, clothes and quilts should be prepared for the baby.
2, the prevention of expired pregnancy: before delivery, let the doctor do fetal heart monitoring, B-ultrasound examination, understand the situation of the fetus in the uterus, and make full preparations for the smooth birth of the baby. If there are no signs of labor this week, it is necessary to prevent overdue pregnancy. First go to the hospital and ask the doctor to confirm whether the expected date of delivery is correct; One week after the expected date of delivery, you should be hospitalized for labor and induced labor if necessary.
3. Avoid "premature water breaking": Under normal circumstances, only when your contractions really start will the egg membrane wrapped outside the fetus and amniotic fluid break under pressure, the amniotic fluid will flow out and the baby will be born. If the fetal membrane is broken and vaginal bacteria invade the uterus before birth, the baby will be in danger. Therefore, in the last stage of pregnancy, prospective parents must avoid the life of husband and wife, do not bring any pressure to the uterus, and prevent "premature water breakthrough".
4. Do more midwifery exercises: After 37 weeks, if everything is normal, you should be prepared for the upcoming delivery. In order to make the production more smooth, you can do more midwifery exercises. For example, you can walk for more than half an hour every day, and you can slowly repeat the steps to exercise every day.
5. Eating during the interval of uterine contraction: Because intermittent uterine contraction pain before delivery may affect appetite, it is necessary to learn the "flexible tactics" of eating during the interval of uterine contraction, eat more delicious and fresh foods that are easy to absorb, less slag, such as egg noodle soup, sparerib noodle soup, yogurt, chocolate and other foods, and drink plenty of water to make yourself full and eat well, so as to have enough strength to give birth.
3 nutrition tips
It takes about 12 hours for primipara from normal uterine contraction to complete cervical opening. If the pregnant mother is a primipara and has no high-risk pregnancy factors, she can prepare some foods that are easy to digest and absorb, with little residue and fresh taste, such as egg noodle soup, sparerib noodle soup, milk, yogurt, chocolate and other foods, and pay attention to supplementing water. You should eat more midwifery foods, such as blood of livestock and poultry, kelp, spring leek, marine fish, bean sprouts, fresh fruit and vegetable juice, etc. Pay attention to replenish water, eat well and store energy for childbirth. If you don't eat well and sleep well, you will be nervous and anxious, easily tired, and easily lead to dangerous situations such as uterine inertia, dystocia and postpartum hemorrhage.
Prenatal diet supplements physical strength for delivery, and protein diet is supplemented for ten months of pregnancy. Four skills of prenatal examination
40 weeks pregnant has reached the expected date of delivery. Usually, the baby will be born in this week, but some babies will be born 1~2 weeks later. Pregnant mothers must pay attention to their physical condition during this period. This week's prenatal examination is very important. Fetal heart monitoring and cervical examination (Bishop score) will be the focus of this week's examination.
1, routine inspection items:
Routine items examined this week include blood pressure, weight, fundus height, abdominal circumference, fetal heart rate, fetal position and urine routine. Routine examination during labor helps doctors to better understand the physical condition of expectant mothers and the development of the fetus, and prepare for the next delivery.
2. Key inspection items:
Fetal heart monitoring and cervical examination (Bishop score) are the focus of this week's examination. During labor, uterine contraction can reduce the circulating blood volume of uterus and placenta and affect the blood gas exchange between mother and fetus. Every time the uterus contracts, the fetus will be subjected to hypoxia test. Fetal heart monitoring during labor can find fetal distress in time, and active treatment, such as oxygen inhalation or changing body position, can improve hypoxia and reduce neonatal asphyxia and mortality.
Cervical maturity examination is one of the necessary examination items before labor. Immature at full term will lead to overdue pregnancy and prolonged labor. Examining cervical maturity can predict in advance, and it is possible to take effective measures to make cervical maturity close to natural cervical maturity.
5 prenatal education small classroom
40 weeks pregnant, this week the fetus should officially meet you. The bones on the fetal head have not completely healed together, which is to make his head more easily squeezed during childbirth, so as to smoothly pass through the birth canal. If you are likely to give birth at any time and feel uneasy or even nervous, then you can have intentional prenatal education.
Meditation can improve your self-confidence, maximize the potential of the fetus, and is also very effective in overcoming depression during pregnancy.
The specific thinking method of prenatal education: put on a comfortable posture to relax the body, and then imagine the most pleasant and stable scene. You are immersed in a beautiful imagination, especially cherish the fetus in your stomach, and pay attention to the changes of the fetus with its broad maternal love. Fetuses get these healthy, positive and optimistic information through their senses, which is the best process of prenatal education.
In fact, from the moment of conception, you can actively imagine the image of the fetus and concretize and visualize your good wishes. Carefully observe the appearance characteristics of you and the prospective father, and combine them to imagine what the fetus will look like, what kind of personality, what kind of temperament, etc. And form a concrete and beautiful image in your mind, and convey it to the fetus with the firm belief that my baby is like this. You can also convey your imagination to the fetus in the womb through language, action, etc., so as to maintain a happy mood and influence him subtly.
Teach you five methods of prenatal education, and prenatal education music recommends 6 pregnancy care.
Finally, 40 weeks pregnant. Many pregnant mothers are expected to give birth this week, but some pregnant mothers have not given birth after 40 weeks. If the pregnancy reaches or exceeds 42 weeks, pregnant mothers should be careful of overdue pregnancy. Therefore, starting from this week, pregnant mothers should prevent overdue pregnancy.
1, reasons for overdue pregnancy
Postterm pregnancy refers to those who have not given birth after 42 weeks of pregnancy, accounting for 3%- 15% of the total number of pregnancies. Postterm pregnancy is an important cause of fetal distress, meconium aspiration syndrome, maturity disorder syndrome, neonatal asphyxia, perinatal death, macrosomia and dystocia. The main reasons for overdue pregnancy are as follows.
(1) The proportion of estrogen and progesterone is out of balance. During normal pregnancy and full-term delivery, estrogen increases and progesterone decreases. If estrogen can not be significantly increased, it will lead to the advantage of progesterone, inhibit the role of prostaglandin and oxytocin, thus causing overdue pregnancy.
(2) The uterine contraction stimulation reflex is weakened. The fetus of some overdue pregnancies is larger, which leads to head-basin asymmetry or abnormal fetal position. The exposed part of the fetus can not be in close contact with the lower uterus and cervix, and the reflex uterine contraction is reduced, which leads to overdue pregnancy.
(3) fetal malformation. When anencephaly teratoma is not complicated with polyhydramnios, it is not enough to stimulate the internal cervix and the lower uterine segment to cause uterine contraction, and the gestational age can be as long as 45 weeks.
(4) Genetic factors. Placental sulfatase deficiency is a rare recessive genetic disease, which can also lead to delayed pregnancy.
2. Symptoms of overdue pregnancy
The stock of fetuses in post-term pregnancy mainly depends on placental function. The placenta functions normally and the fetus continues to grow. Overweight fetus at birth, even macrosomia or dystocia are all caused by calcification of skull. The placenta is aging due to expiration, its function is incomplete, and its blood flow and oxygen supply are insufficient. The fetus is a "little old man" (premature infant syndrome). Due to lack of oxygen, the fetus excretes meconium and amniotic fluid, fetal skin, amniotic membrane and umbilical cord, resulting in low birth score and high mortality. Postterm pregnancy has a great influence on both mother and baby.