why do babies arrive pass there due date?

Answer 1

Predicting a due date isn't an exact science. Babies come when they're ready.

Answer 2

A due date is an educated guess based on when a woman's last menstrual cycle was. But couting this way implies that all women ovulate on the same day of their menstrual cycle, which is untrue. Because ever body is different the closest we can get is an average guess on a due date. It's a working tool we need as doctors and patients, but it is never an exact date because the date of conception cannot be known and because some babies mature faster than other at the end of pregnancy. The only thing that can really trigger a birth is when the baby can breathe on it's own and it's lungs send out a hormone to the mother that it's ready to be born, and labor begins.

Answer 3

Because due dates are an educated guess based on the date of the woman's last menstral period, and assumes a 28 day cycle. Not all women have a 28 day cycle...some are a few days less and some are a few days more. Also, the date of conception is not always known. Finally, perhaps the baby is just not ready.

Answer 4

Due dates are just estimates. It is totally normal for babies to arrive at 38-42 weeks, so doctors say 40 weeks to estimate.

Also ovulation and periods aren't always regular, so one really can't say when the pregnancy starts. The date of the last period is sufficient in most cases, so many go by this.

Answer 5

Most of the time babies are 2 weeks early or 2 weeks late. Very rarely is it on time because they go by you lmp and ultrasound can tell you how many weeks you are. But babies come out when they want to :).

12 weeks and 3 days....again. 1 month behind estimated due date! Due Aug 5th but hoping due date is still July 12th.

Answer 6

Because you never know when the baby is ready to come out, not all babies come at exactly on there due date. Due dates are a day just to pinpoint on when the baby will be coming around, not on that exact day!

And when a baby comes after the due date, its because the baby wasn't ready or the due date was wrong.

Answer 7

there is no exact due date given well in most cases docs will tell the expecting parent give or take a couple weeks babies due dates are given according to moms info and some times by the ultra sound and by the groth , so there is no exact pin point day to say baby will be born on january 12 instead of jan 20

Answer 8

Some pregnancies are post-term. But as it turns out, others are actually the result of the incorrect assignment of a due date. Due dates are tricky because it's hard to pinpoint the exact age of a fetus. Reasons for this include irregular periods, sketchy or inaccurate menstrual history presented to the obstetrician, and mistaking spotting during very early pregnancy for a period. Doctors usually use several methods together to make their best estimate of a due date, including:


Calculation based on your last ovulation (the most reliable method
Calculation based on the first day of your last menstrual period
Clinical examination of the uterus for size
Your first detection of fetal movement (the fetus usually makes its first movements between 16 and 20 weeks)
Fetal heartbeat (in normal pregnancies, the doctor can detect it between 18 and 20 weeks)
Ultrasound which during early pregnancy can estimate fetal age within 7 to 10 days (it's not as effective later in the pregnancy)
Unfortunately, if you have irregular cycles it could prove difficult to accurately predict a due date.

Answer 9

Predicting due dates is not an exact science. At best, the supposed due date is in the middle of a 4 week span of time.

Also keep in mind that babies do not have timers that pop up to say they are ready. Each one is different. :)

Answer 10

Doctor's base the due date by the size of the embryo, and things such as how far along their organs have developed. When I was pregnant my doctor gave me a week to two week time frame from my actual due date. Basically babies come when they are good and ready.