As you approach childbirth, you have a lot of things on your mind, right? Sometimes you even get a little scared. Today we're going to talk about something that happens quite rarely, but it's very important for every mother to know about. That is, there is a slight mismatch, or more precisely, a size problem, between the baby's head and the mother's pelvis. Doctors call this Cephalopelvic Disproportion (CPD) . Although the name is a bit long, in simple terms, it's like a small blockage in the way for the baby to come out.
What is Cephalopelvic Disproportion?
Simply put, this happens when your baby's head doesn't come out of your pelvis properly during labor. Think of it like putting a key in a lock. Sometimes if the key is bigger than the lock, it gets stuck, right? That's what happens here.
This is actually a relatively rare complication . But if it does happen, labor can take a while, meaning it can be difficult. In that case, someone experienced in helping with labor – your midwife, obstetrician, or other qualified health worker – should definitely step in and help.
Why can't the baby come through the pelvis? What are the reasons?
Good question! There could be several reasons for this. Let's look at the main ones:
1. The baby's head is larger than normal.
Sometimes the baby's head may be slightly larger than the mother's pelvic opening. There are a number of reasons why this may happen:
- When the baby is born days later than the due date: The baby may be a little bigger.
- If the mother gains too much weight during pregnancy: This can also have an impact.
- Family history: You may have heard that some families tend to have larger babies. There may also be a genetic influence.
- Some medical conditions in the mother: For example, if the mother has diabetes mellitus , or gestational diabetes, which occurs during pregnancy, the baby may be slightly larger.
- For mothers who have given birth previously (Multiparity): Sometimes the second and third babies may be slightly larger than the first baby.
- If the parents' body mass index (BMI) is high: That is, if the parents are obese (BMI greater than 30) or overweight (BMI greater than 25), there is a chance that the baby will also be large.
2. There is a problem with the baby's position.
The baby needs to be in the correct position when entering the pelvis. Otherwise, if the baby's head is turned to the side or face up, it can be difficult to come out. We'll talk about how it should normally be later.
3. Decrease in size or change in shape of the mother's pelvis
Some mothers may have a smaller than normal pelvic opening, or the shape of the pelvis may change slightly.
- When you get pregnant at a very young age, around 15-16 years old: The pelvis may not have fully matured skeletally, making it difficult to give birth.
- If there are any pelvic malformations: Sometimes abnormal growths of the pelvic bones or conditions where the bones are displaced can affect this.
- If the mother is very thin and has a small body: The pelvic opening may be smaller accordingly.
- If there has been a previous injury to the pelvis, such as a fractured pelvis: The pelvic joints may not stretch properly during childbirth.
How does a normal childbirth happen?
To understand this condition called CPD, it's helpful to have a little idea of how childbirth usually occurs.
A few weeks before the baby is due, the baby starts to move into the correct position. This means that the baby moves down and into the pelvis. This is called "baby dropping."
Then the baby is usually:
- Head turned down.
- The face is turned towards the mother's back.
- Chin pressed to chest.
Now, when labor begins:
1. The baby's head enters the mother's pelvic opening.
2. The pressure from the baby's head causes the mother's pelvic joints to stretch a little, which makes the cervix a little wider.
3. Then, the baby's body is rotated slightly, allowing both shoulders to pass through the pelvis.
4. As the uterus contracts, or "pains," the baby gradually pushes downward.
5. Finally, the baby comes out of the vagina.
Think about it, this is a very amazing, natural process. But sometimes there can be small disruptions to this. That's when we talk about conditions like CPD.
How common is cephalopelvic disproportion (CPD)?
This condition is actually very rare . Roughly speaking, about one in 250 babies born have this condition. So there's nothing to worry about.
Does the shape of the pelvis also affect this?
Yes, there are some pelvic shapes that have a narrower opening, making it harder for the baby to come out. Two pelvic shapes that are more likely to cause CPD are:
- Flat/Platypelloid pelvis: The pelvis of someone with this type of pelvis is oval, wide on both sides but narrow from top to bottom.
- Heart-shaped/Android pelvis: In this, the pelvic opening is wider at the top and narrows towards the bottom.
But here's the thing, you can't say that CPD will occur just because you have this kind of pelvic shape. It depends on many factors, such as the size of the baby and the position it is in.
At what point in labor does CPD occur?
CPD is usually diagnosed early in labor , especially during the active phase of labor, when the cervix is dilating and the baby is moving down.
What are the symptoms of CPD? How do doctors diagnose it?
Doctors suspect CPD when labor does not progress as expected. This is called "failure to progress." There can be many reasons for this, and CPD is one of them.
Situations where you may think "labor is not progressing":
- If you are having your first baby, your labor will last 20 hours or more.
- If you have already had babies, if the labor lasts 14 hours or more.
In addition, there may be signs like these:
- The baby's head doesn't descend towards the pelvic opening and seems to be stuck in one place.
- Uterine contractions are occurring, but they are not strong enough to push the baby down.
- Thinning and dilation of the cervix may be very slow, or may not occur at all.
How is CPD diagnosed?
It is often difficult to diagnose this condition before labor begins . If labor does not go as expected, skilled birth attendants will investigate whether CPD is the cause.
They can do things like this:
- To find the exact position of the baby by feeling over your belly.
- Checking your cervix to see if it is opening properly.
- Using a fetal monitor to monitor the baby's heartbeat and uterine contractions.
Can CPD be diagnosed before birth?
When you go to the doctor during your pregnancy, they do an ultrasound scan to measure the baby's growth, right? The scan can also measure the size of your pelvic opening. However, these measurements are not always 100% accurate. So it's a little difficult to tell for sure if you have CPD before you give birth.
How is CPD treated?
Even if this situation arises suddenly, doctors use various methods to assist in the delivery of the baby.
- You can try to carefully remove the baby through the pelvis using a vacuum extraction device or forceps .
- Otherwise, you may need to have a cesarean birth (C-section) . This means that the baby is delivered through a small cut in your abdomen. This is often the safest option for CPD.
What other complications can occur due to CPD?
Sometimes, attempting a vaginal delivery while having CPD can cause complications for the mother or baby.
- The baby's shoulders can get stuck in the pelvis. This is called shoulder dystocia . If this happens, an emergency cesarean section may be required.
- The mother may develop vaginal tears or postpartum hemorrhage .
That's why, if doctors suspect CPD, they often resort to a cesarean section immediately. This is for the safety of both mother and baby.
Can cephalopelvic disproportion (CPD) be prevented?
In fact, CPD is not always preventable. Some mothers have risk factors for it, but they can still have a normal delivery without complications. It is also possible to have a successful vaginal birth even if the scan shows that the baby is a little big, or if there is a small problem with the pelvis.
However, the most important thing is to identify risk factors early so that your doctor can talk to you and discuss the safest options before giving birth.
Does CPD affect the baby after birth?
Usually, CPD does not have any long-term effects on the baby's health after birth. Once the doctors manage it properly and deliver the baby, the baby is healthy.
If I had CPD in a previous pregnancy, is it possible for it to happen again?
Just because you had CPD in a previous pregnancy doesn't mean it will happen again in every subsequent pregnancy. Many people have been able to successfully deliver their babies vaginally in subsequent pregnancies.
However, if the mother's pelvic opening is really small, or if there is a family history of large babies, there may be a chance of CPD recurring. So, if you have had CPD in the past, it is best to talk to your doctor about it during your next pregnancy.
Take-Home Message
Okay, so I hope you now have a better idea about the cephalopelvic disproportion we talked about today.
Simply put, CPD is a somewhat rare condition in which the baby's head is unable to emerge through the mother's pelvis.
This can be due to several reasons – things like the baby getting bigger, the mother's pelvis getting smaller, or a change in its shape.
- This is often diagnosed during childbirth.
- In most cases, the safest treatment is a cesarean section.
- The most important thing is that this condition usually does not affect the long-term health of either the mother or the baby.
So, don't be unnecessarily afraid of this. However, it is very important to know that this condition exists and that doctors can deal with it. Talk to your doctor about everything openly. Then the best thing will happen to you and your baby!
` Cephalopelvic disproportion, childbirth, baby's head, mother's pelvis, cesarean section, pregnancy health, obstetric complications
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