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Exceeds 40 weeks of gestation
- A pregnancy is referred to as overdue pregnancy if it exceeds 40 weeks of gestation.
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Overdue – have you gone past your due date? Unless you're having a planned caesarean, it's impossible to know exactly when your little one will arrive. Pregnancy usually lasts between 37 and 42 weeks.
Jul 27, 2022 · Overdue pregnancy: What to do when baby's overdue. An overdue pregnancy can leave you tired and anxious. Learn about possible causes and what it can mean for you and your baby. By Mayo Clinic Staff
- Overview
- What does it mean to have an overdue pregnancy?
- How are due dates calculated?
- What causes a baby to be born later?
- What are the risks of an overdue baby?
- What will happen if your baby is overdue?
- Takeaway
As you reach the end of your pregnancy, you may be feeling a mix of emotions about labor and delivery. Despite any worries about what lies ahead, you’re almost certainly ready for your pregnancy to end. After all this waiting, you want to meet your baby!
As your due date approaches (or even passes) if you haven’t gone into labor, you may be concerned. You might wonder if your baby is healthy, if your body is working properly, or feel like your pregnancy will ever end!
What does it mean to have an overdue baby? Are there medical risks associated with remaining pregnant past your due date? What should you expect to happen next after your due date passes?
Don’t worry, we’ve got you covered with the answers you’re seeking!
With all the different dates and terms you hear during pregnancy, it may be difficult to determine when you can expect to meet your baby! The American College of Obstetricians and Gynecologists (ACOG) uses the following definitions:
•early term: 37 through 38 weeks
•full term: 39 through 40 weeks
•late term: 41 through 42 weeks
•post term: beyond 42 weeks
Babies born before 37 weeks are considered premature and those born after 42 weeks are called postmature. (This can also be called a prolonged or overdue pregnancy.)
The actual date of conception for a baby is hard to know, so gestational age is the most common way to calculate how far along a pregnancy is and predict your due date.
Gestational age is measured using the first day of your last menstrual period; 280 days (or 40 weeks) from this day is the average length for a pregnancy. This is your estimated due date, but the key word is “estimated,” since it’s nearly impossible to predict when a baby will actually be born!
The weeks surrounding your estimated due date are your due date window, and birth is likely to happen at any time during that period.
If you have no idea when your last period was, became pregnant while using oral contraceptives, or have extremely irregular menstrual cycles, your doctor will likely request an ultrasound to determine the gestational age of your baby. The ultrasound allows your doctor to measure the crown-rump length (CRL) or the distance from one end of the fetus to the other.
During your first trimester this CRL measurement can offer the most accurate estimation of the baby’s age, because all babies grow at roughly the same speed during that time.
However, during the second and third trimesters babies grow at different speeds, so this ability to accurately estimate age based on baby size diminishes.
Why is your baby deciding to take a little longer to be born? Some common reasons include:
•This is your first baby.
•You have a history of giving birth to post term babies.
•Your family has a history of giving birth to post term babies.
•You have obesity.
•Your baby is a boy.
When a labor extends beyond 41 weeks (late term) and beyond 42 weeks (post term) there are increased risks of certain health problems. Some of the most common risks associated with a post term baby are:
•fetal macrosomia, or being significantly larger than average at birth, which can also increase the risk of cesarean delivery or shoulder dystocia (getting a shoulder stuck behind the mother’s pelvic bone during delivery)
•postmaturity syndrome, characterized by baby not gaining weight past their due date, as well as dry or “loose” skin and long fingernails and toenails at birth
•low amniotic fluid, which can affect a baby’s heart rate and cause the umbilical cord to compress during contractions, resulting in a lack of oxygen flowing to the fetus
•meconium in the lungs of the baby, which can lead to serious respiratory problems
•stillbirth, when a baby dies before delivery
If your due date has come and gone, you can rest assured that you will continue to receive medical care. In fact, you’ll probably have more visits each week with your midwife or OB-GYN than you previously did!
At each of your appointments, you can expect that your doctor will check the size of your baby, monitor baby’s heart rate, check baby’s position, and ask about baby’s movement.
Your doctor may suggest some extra monitoring and medical tests to make sure that your baby is healthy. (Many doctors will begin to recommend this around 40 or 41 weeks.)
They’ll also ask you to be extra vigilant in performing kick counts, records of your baby’s movements.
Testing may occur once or twice a week and can include:
•Nonstress test (NST). This measures your baby’s heartbeat for a period of time (usually around 20 minutes).
Most babies are born within a few weeks of their due date. If you find yourself nearing the end of your estimated due date window with no signs of labor, there may be actions you can take to help nudge your baby into the world.
Before doing so, you should always consult with your doctor or midwife. They can discuss the benefits and risks of your specific health situation and offer guidance on the safest ways to help your little one arrive in your arms.
Are you watching the days pass by because your baby is late on arrival? Here’s the scoop on an overdue pregnancy, and a few ways to jumpstart your labor so you can get that baby moving.
A pregnancy that continues for longer than 42 weeks is called post-term, prolonged or overdue. Over 80 in 100 babies arrive before 41 weeks of pregnancy and 99 in 100 arrive by 42 weeks of pregnancy. This may feel fine, or you may feel like you’ve had enough well before that date.
Nov 22, 2021 · Your due date is just an estimate – in fact, only 5 percent of women actually give birth on that day. If your due date comes and goes and you're pregnant, don't worry. Ob-gyns and midwives know exactly how to help with an overdue pregnancy.
Jul 15, 2022 · Overdue pregnancy: causes and risks. Medically reviewed by Dr Deepti Gupta, Gynaecologist and Obstetrician. Written by Priya Solomon Bellani | 15 Jul 2022. Photo credit: iStock.com / DragonImages. Is it normal for a pregnancy to go past the expected due date? How many weeks pregnant is considered overdue? Advertisement | page continues below.
