In terms of delivery methods, many mothers choose to have a normal delivery. However, the requirements for the baby and their own delivery are relatively high, today we will talk to you, how big is the pelvic bone suitable for normal delivery?
How big is the pelvic bone for normal deliveryExperts say that the transverse diameter of the pelvic outlet refers to the distance between the two sciatic tuberosities, and the average length is about 9cm, which is the meridian of the fetal prelude through the pelvic outlet, and this meridian has a close relationship with the labor and delivery. If the transverse diameter of the pelvic outlet is slightly shorter, and the sum of the transverse diameter of the outlet and the posterior sagittal diameter >15cm, the normal-sized fetus can still be delivered vaginally.
Babies born naturally have a low probability of developing lung disease. The regular contractions of the uterus during labor and delivery can exercise the fetal lungs, and alveolar expansion promotes the maturation of the fetal lungs, so that pulmonary hyalinosis rarely occurs in children after birth. Some statistics show that the rate of pulmonary hyaline membrane disease in children born by cesarean section is 20 times higher than that of children born vaginally. Severe pulmonary hyaline membrane disease can lead to respiratory distress and even death. At the same time, regular uterine contractions and the squeezing effect of passing through the birth canal can expel amniotic fluid and mucus from the respiratory tract of the fetus. Complications of wet lung and aspiration pneumonia in newborns can be greatly reduced.
Not only that, when delivering vaginally, the fetal head is squeezed by the uterine contraction and the birth canal, and the head congestion can increase the excitability of the respiratory center of the brain, which is conducive to the rapid establishment of normal respiration of newborns after birth. At the same time, immunoglobulin G (lgG) can be passed from mother to fetus during natural delivery, and newborns born naturally have stronger resistance. The fetus is exercised by touch, taste, pain and proprioception in the birth canal, which promotes the development of the brain and vestibular function, and is good for future sports and personality.
Not all women are suitable for normal labor, if the fetal position is abnormal and the pelvis is small, these can be measured in advance by ultrasound. Relative indications, such as overdue labor (late baby), huge baby, temporary abnormal changes in fetal position. It is only for women with such obvious indications that doctors will recommend a cesarean section.
Internal and external pelvic measurements affect normal laborWhy the pelvis affects normal labor is answered today with a look at the picture. The size of each part of your pelvis is closely related to the size of your baby, so during a normal delivery your doctor will usually measure each dimension of your pelvis?
Specific dimensions required for a normal deliveryInter-iliac spine diameter (IS) Pregnant women lie on their backs and measure the distance between the outer edges of the two anterior superior iliac spines with a pelvic measuring tape; the normal value is about 23-25 cm.
Inter-iliac crest diameter (IC) Pregnant women lie on their backs and measure the widest distance between the outer edges of the two iliac crests; the normal value is about 25-28 cm.
Sacrospinal and shameful outer diameter (EC) Pregnant women lie on their sides with their upper legs straight and their lower legs bent, measure the pubic symphysis and the pubic bone union; the normal value is about 25-28 cm. With the upper leg straight and the lower leg bent, the distance from the midpoint of the upper edge of the pubic symphysis to the inferior aspect of the spinous process of the fifth lumbar vertebra is measured, with a normal value of 18-20 cm. This diameter can be used to indirectly estimate the size of the anterior and posterior diameters of the pelvic inlet.
The intersciatic tuberosity (TO) is the distance between the medial parts of the two sciatic tuberosities, with a normal value of 8.5-9.5 cm, representing the transverse diameter of the pelvic outlet.
Check the size of the biparietal diameter of the fetus against this to know if it is suitable for normal delivery.
Suggestions: Be prepared for a cesarean section; be prepared for a normal delivery. Once you start labor, the fetal biparietal diameter measured by ultrasound at the time of delivery by the doctor at the hospital is the decisive data for the final decision on the mode of delivery. But as long as you're prepared for both types of delivery, you won't be caught off-guard when the time comes to see which one the doctor recommends. Either way, modern medical treatments are more sophisticated and there's no need to worry.
The most important thing to prepare for is your mindset. Don't be nervous, and be objective about whatever way you deliver your baby. Just trust the hospital in a down-to-earth way. Apply for anesthesia if you are afraid of pain. Both can be anesthetized.