02.01.2014

38 weeks pregnant chances of delivery

The actual birth dates are spread around this 40 week due date in approximately normal distribution (bell curve). She gave birth a week and a half after his return (on September 8th) to a healthy and beautiful baby girl.
Enter your email address:Our weekly newsletter with stories, puzzles and ideas can spice up your weekend and help present math to your family as a toy and a friend. In a recent study, researchers grouped ultrasound scans by <7 weeks, 7-10 weeks, 11-14 weeks, 14-19 weeks, and 20-27 weeks (Khambalia et al. In the Listening to Mothers III study, one in four women (26%) reported that their care provider changed their estimated due date based on a late pregnancy ultrasound. This method does not work because many women are induced when they reach 39, 40, 41, or 42 weeks. In a very important study published in 2001, Smith looked at the length of pregnancy in 1,514 healthy women whose estimated due dates, as calculated by the last menstrual period, were perfect matches with estimated due dates from their first trimester ultrasound (Smith 2001). Women who had embryos that took longer to implant were more likely to have longer pregnancies. With her first pregnancy, Shannon did not go into labor on her own by 42 weeks, and so she was induced with Cytotec. Overall, researchers found that half of your chance for having a post-term birth comes from genes. Experiencing environmental stress towards the end of pregnancy (at 33-36 weeks) (Margerison-Zilko et al. Rebecca went in to labor at 41 weeks expecting a home birth, but soon after labor began she noticed that her blood pressure was high and she had a headache. Other risks for post-term pregnancy include having low fluid, and something called dysmaturity syndrome (growth restriction plus muscle wasting), which happens in about 10% of babies who go past 42 weeks. In this section, we will talk about how the risk of stillbirth increases towards the end of pregnancy. Up until the 1980s, some researchers thought that the risk of stillbirth past 41-42 weeks was similar to the risk of stillbirth earlier in pregnancy. Excluded premature births (<37 weeks 0 days), babies with congenital problems, and babies that did not have ultrasound dating. Three out of three meta-analyses that looked at C-section rates found that there was a slightly lower Cesarean rate in women who are assigned to labor induction at 41 or 42 weeks, compared to women who are assigned to expectant management. In 2013, two separate groups of researchers made headlines when their meta-analyses came out, showing that elective induction in general (not just induction at 41 or 42 weeks) decreases the Cesarean rate (Mishanina et al. Women were taught how to do kick counts every day and had nonstress tests 3 times per week.
You can see that around 90% of babies are born within three weeks of their due date, and 21% are born within 3 days of it.


Elective inductions might occur for social reasons, like the doctor wanting the mom to give birth before he or she goes out of town, or other non-medical reasons like the mother wanting to be done with an uncomfortable pregnancy. Based on the records of 100 pregnant women, Boerhaave figured out the estimated due date by adding 7 days to the last period, and then adding nine months (Baskett & Nagele 2000).
At her 40 week appointment with her OB she was informed that she was two centimeters dilated and they talked about waiting for induction until 42 weeks.
The researchers found that 50% of all women giving birth for the first time gave birth by 40 weeks and 5 days, while 75% gave birth by 41 weeks and 2 days.
When she reached 42 weeks, she risked out of a home birth and began planning for a hospital birth. After excluding women who had preterm births or pregnancy-related medical conditions, the final sample of 113 women had a median time from ovulation to birth of 268 days (38 weeks, 2 days after ovulation).
Also, women who had a specific sort of hormonal reaction right after getting pregnant (a late rise in progesterone) had a pregnancy that was 12 days shorter, on average.
There are two very important things for you to understand when learning about stillbirth rates in post-term pregnancies. In many geographical places, the right side of this distribution is sharply raised and cut at 42 weeks because the majority of the women that have not delivered by the 42nd week are being induced. These women are being randomly assigned to elective induction at 39 weeks OR waiting for labor to start on its own (expectant management), up until 41 weeks. Their goal is to find out that when all women give birth by 39 weeks, there are better outcomes than letting women wait for spontaneous labor. The authors found that the most accurate time to perform an ultrasound to determine the gestational age was 11-14 weeks. Meanwhile, 50% of all women who had given birth at least once before gave birth by 40 weeks and 3 days, while 75% gave birth by 41 weeks. When labor finally started on its own at 43 weeks, her baby was born too quickly to make it to the hospital, and she ended up with an accidental unassisted home birth after Cesarean. The median time from the first day of the last menstrual period to birth was 285 days (or 40 weeks, 5 days after the last menstrual period). About half of all women will go into labor on their own by 40 weeks and 5 days (for first-time mothers) or 40 weeks and 3 days (for mothers who have given birth before). All of the researchers found a relative increase in the risk of stillbirth as pregnancy advanced. In particular, newborns are more likely to die (although the overall risk was still very low) if they are born before 39 weeks, or after 41 weeks.
A large body of evidence shows that ultrasounds done in early pregnancy are more accurate than using LMP to date a pregnancy.
The length of pregnancy ranged from 36 weeks and 6 days to one woman who gave birth 45 weeks and 6 days after the last menstrual period.


Two years later, Shannon gave birth again spontaneously at 41 weeks and 2 days (after membrane stripping), and her sister had a post-term pregnancy and went into labor spontaneously at 42 weeks 5 days. They also estimated that 1,476 women would need to be electively induced at 41 weeks in order to prevent one stillbirth or infant death. At 41 weeks and 1 day, Jenny went into labor on her own, and her baby was born weighing 6 lbs, 5 ounces, and was covered with a bit of vernix. At around 41 weeks, women were randomly assigned to either induction of labor or fetal monitoring (expectant management).
The chance of a newborn having problems is lowest if he or she is born between 39 weeks and 0 days and 40 weeks and 6 days (Spong 2013). So if a woman is considering expectant management after 41 weeks, one of the benefits is that if she goes into labor on her own, she will have a relatively low risk of Cesarean.
He proudly showed it to her, explaining that her chances of giving birth before he returns are only 4.3%.
The researchers found that women who had an early ultrasound to date the pregnancy were less likely to be induced for a post-term pregnancy.
This could be risky if the baby is experiencing growth restriction, as growth-restricted babies have a higher risk of stillbirth towards the end of pregnancy.
This means that the researchers knew the exact days that the women ovulated, conceived, and even when their pregnancies implanted! Using an estimated due date from either the LMP or an ultrasound at 20-27 weeks led to a higher rate of pre- and post-term births.
If someone said that the risk of having a stillbirth at 42 weeks compared to 41 weeks is 50% higher, then that sounds like a lot. They just want to know what the risk would be if they waited one more week until the next appointment, or even a few days.
The researchers calculated that there would need to be 328 to 410 elective inductions at 41 weeks to prevent 1 perinatal death.
In a large observational study that enrolled more than 17,000 women in Finland, researchers found that ultrasound at any time point between 8 and 16 weeks was more accurate than the LMP. Instead, we need to know how many stillbirths happen at 41 weeks compared to all pregnancies and births at 41 weeks.



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