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Doctor insights on: Gestation Age

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At what gestational age will my milk come in?

After delivery: The milk production will not start until after you deliver. ...Read more

Dr. Jan Lei Iwata
4 Doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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How does gestational age impact fetal weight?

Fetal age and weight: As a normal fetus increases in gestational age, it normally will also increase in fetal weight. ...Read more

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Is gestational age accurate from ultrasound at 9 weeks?

Is gestational age accurate from ultrasound at 9 weeks?

Yes it is: By that point, ultrasound is the primary tool to estimate gestational age. More accurate than last menstrual period. ...Read more

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Don't ultrasounds start gestational age from your LMP date?

Don't ultrasounds start gestational age from your LMP date?

Yes: All pregnancies are dated from the first day of the last menstrual period but an early ultrasound is more precise and may change the due date if greater than a 5 day difference. Gd luc. ...Read more

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At what gestational age of fetus should the bpd measure approximately 4.1cm (41mm)?

At what gestational age of fetus should the bpd measure approximately 4.1cm (41mm)?

BPD: Well we use more than just bpd to calculate the gestational age. Head circ., femur length, and abdominal circ. Also go into the calculation. However, 4.1cm bpd is consistent with about 17 weeks 4 days. ...Read more

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Bases on my LMP im 8 weeks. But gestational age was 9 weeks. Why? Did I ovulate sooner?

Bases on my LMP im 8 weeks. But gestational age was 9 weeks. Why? Did I ovulate sooner?

LMP & ovulation: Ovulation can occur anywhere from 14 days to 21 days after the LMP dependent upon the length of your menstrual cycle. When pregnancies are computed we use the LMP as an ESTIMATE to standardize the pregnancy length which is accurate to only Plus or minus 10 to 14 days. In other words, trying to backdate ovulation after pregnancy is difficult and is only a "guesstimate". ...Read more

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How many days does it take for the bleeding to stop if misscariage happened in 5 weeks gestational age?

How many days does it take for the bleeding to stop if misscariage happened in 5 weeks gestational age?

Varies: The bleeding associated with a miscarriage is going to vary widely from person-to-person. There is simply no way to know how long it will take to pass all of the tissue. In some cases surgery will be required. ...Read more

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What is the earliest day intercourse could have happened if gestational age at 12/12/13 was 9 weeks 1 day?

What is the earliest day intercourse could have happened if gestational age at 12/12/13 was 9 weeks 1 day?

10/19/2012: If you were 9 1/7 weeks on 1212/13, it is most likely you ovulated on 10/22/12. In general, sperm can live for up to 48-72 hours prior to conception. Therefore, this would be the window for conception. ...Read more

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If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

12+4 weeks: Crown-rump length in fetus:
57 mm= 12+2 (50%) weeks,
62mm= 12+4 (50%) weeks

reference: http://www. Bmus. Org/policies-guides/23-17-3-161_ultbmus. Pdf. ...Read more

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When a fetus is "measuring small" how is that determined? Wouldn't it just mean that the fetal / gestational age is off?

When a fetus is "measuring small" how is that determined? Wouldn't it just mean that the fetal / gestational age is off?

Yes and no: Yes, if the gestational dates are off. No, if they are not and the biparietal diameter of the fetus does not "measure up" to the appropriate age indicating "small for gestational age or intrauterine growth retardation.". ...Read more

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Why are fetal measurements measured by weeks plus days and not just by weeks? Are the # of days just as important to determine gestational age?

Why are fetal measurements measured by weeks plus days and not just by weeks? Are the # of days just as important to determine gestational age?

Precision: By convention gestational age is stated in weeks. For precision and accuracy weeks and days are usually indicated when specifying a gestational age. For example, some tests may be done at 15 weeks but not at 14 weeks and 6 days - so the number of days is important as well. ...Read more

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Is the gestational age of a fetus measured by how big it is? If so, can't some fetuses be bigger than others which can cause due dates to be off?

Is the gestational age of a fetus measured by how big it is? If so, can't some fetuses be bigger than others which can cause due dates to be off?

Yes.: Ultrasound measurements of the fetus to determine gestational age are always reported as a range, which can be as much as 3 weeks late in pregnancy. ...Read more

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At 7 weeks and 3 days (past lmp) 5 weeks 3 days since conception my scan says 11.8 mm what does this mean and is this right for gestational age?

Perfect: Both of your dates match and this is a perfect measurement for seven weeks and three days. Absolutely no worries at this point. ...Read more

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Lmp- 1st oct.'12 for 3 days. 3rd u/s onwards done in 12th week, my LMP as per gestational age comes to be 27th sept. Could I have conceived on 25th sep?

No: If I understand you correctly, your actual LMP (10/1) and your estimated LMP based on the measurements of the fetus during ultrasound (9/27) are very consistent. You could not have conceived on 9/25. It would have happened about two and a half weeks later. ...Read more

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Is gestational age counted from conception?

Is gestational age counted from conception?

LMP: By tradition, it is calculated from the first day of the menstrual period which led to the pregnancy. ...Read more

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Do you give or take 2 weeks from the edd or gestational age?

Do you give or take 2 weeks from the edd or gestational age?

Pregnancy weeks: The number of average total weeks from last period is 40 weeks to due date. If someone conceives 2 weeks after menstrual period that means she will conceive about 38 weeks later. The standard when stating how pregnant you are is determined from the last menstrual period however. Example : if you conceived 8 weeks ago you would be called 10 weeks pregnant. ...Read more

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Can gestational age on a scan indicate when sex/conception. Was?

Can gestational age on a scan indicate when sex/conception. Was?

Yes ask your OB: If you have regular 28 day cycles then u can figure back, your OB should be able to do it for u. ...Read more

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Why does my gestational age date back to April 15th when my lmp was march 24?

Gestational age: Most medical providers "date" the onset of pregnancy from the "lmp", but more accurate dating is from an ultrasound. Also, ovulation occurs after the period and it may be delayed by a week or so. As your pregnancy progresses, the ultrasound exam will provide a much more accurate gestational age. ...Read more

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Why does my gestational age date back to April 15th if my lmp was March 24th?

Why does my gestational age date back to April 15th if my lmp was March 24th?

Late ovulation: I'm not sure I understand your question, do you mean that you were 0 days pregnant on April 15th based on your due date? If this is the case, then it is possible that you ovulated later than expected based on average cycle length and your date was changed based on the measurement of the baby based on ultrasound. The very first dating ultrasound gives you your due date. ...Read more

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Is there a significant difference between gestational age of 14 weeks and 18 weeks?

Yes 4 weeks!!!: U are either 14 or 18 cannot be both and an us should give u good dates 18 much more developed than14 weeks can see much more on us. ...Read more

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Is your gestational age calculated from your baby measurements or from your LMP date?

Is your gestational age calculated from your baby measurements or from your LMP date?

Initially, from LMP: The edc (estimated date of "confinement") is based on the first day of the last menstrual period. But the edc may be adjusted on the basis of early ultrasound exams which can pinpoint the due date to plus or minus less than one week. Ultrasound dates are based on fetal measurements. Hope this helps. Lgromkomd. ...Read more

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My gestational age doesn't date back to my lmp march 24th it dates back to April 15th why is this?

My gestational age doesn't date back to my lmp march 24th it dates back to April 15th why is this?

It depends on method: It depends on the method (s) used to determine gestational age such as ultrasonography as well as whether the March 24 period was a "full" and normal period. Ask your OB MD how the new gestational age dates were determined. ...Read more

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Need advice on what is the the difference between the gestational age of a fetus and how many weeks you are?

Need advice on what is the the difference between the gestational age of a fetus and how many weeks you are?

Same thing: The way you count is from your last period, it is 40 weeks from your last period until your due date so when you are 6 weeks gestational age it means 6 weeks from your last period which is how many weeks u are (most people get pregnant 2 weeks after their last period) but u always count from the 1st day of the last period, and in my office in coral springs, fl, I always do an early ultraosund. ...Read more

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Can the reading of a 10 week gestational age be wrong? Is it possible that the crown can be larger than other fetuses?

Yes: Prenatal ultrasounds are not 100% accurate. Readings also depend on the training and experience of the tech and the ob. Ultrasonography cannot detect certain anomalies in the fetuses. There have been cases when fetuses have been aborted to find out, in the post-mortem, that they were perfectly normal. But, ultrasound remains a great diagnostic tool and many lives have been saved by it. ...Read more

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What gestation age does your milk come in?

What gestation age does your milk come in?

Lactogenesis: The production of milk, lactogenesis, happens in two phases. The first phase happens around the 16th week of gestation. The second phase occurs shortly after delivery of the fetus. ...Read more

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How accurate is gestational age at 13 weeks via ultrasound?

About 7 days: First trimester ultrasounds are the most accurate, but a 13 week ultrasound should be quite good at estimating the due date. Best of luck! ...Read more