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Doctor insights on: How Many Weeks Into Gestation Can A Fetus Breath

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Would there be a (big) difference in the measurement if a 12wk old fetus compared to a 9wk old fetus? The gestational age would be determined in u/s?

Would there be a (big) difference in the measurement if a 12wk old fetus compared to a 9wk old fetus? The gestational age would be determined in u/s?

Yes: An first trimester sonogram is fairly accurate at dating a pregnancy (within a margin of error of about a week). At 12 weeks menstrual age with a viable pregnancy a sonogram measurement of 9 weeks would change the dating of the pregnancy and your due date should be based on that sonogram. Later sonograms should not change this established date. ...Read more

Dr. Linda Callaghan
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 much of a risk is gestational diabetes to the fetus?

How much of a risk is gestational diabetes to the fetus?

Profound.: High blood sugar during fetal development can lead to excessive growth (macrosomia), predispose to adult diabetes mellitus, increase the risk for cesarean section, shoulder dystocia and fetal death from cardiac arrhythmias and hypertrophic cardiomyopathy. Most women with gdm have normal outcomes, but are at increased risk for all of the above, as well as polyhydramnios, preeclampsia (hypertension). ...Read more

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How much of a risk is gestational diabetes for the fetus?

How much of a risk is gestational diabetes for the fetus?

Baby may be at risks: Excessive birth weight. Early (preterm) birth and respiratory distress syndrome. Low blood sugar (hypoglycemia). Jaundice. Type 2 diabetes later in life. ...Read more

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10+-6days weeks pregnancy crl 3.9.Fhs 162.Growth of fetus is acc to gestational age .Is growth normal♥?

10+-6days weeks pregnancy crl 3.9.Fhs 162.Growth of fetus is acc to gestational age .Is growth normal♥?

Yes: If the report says the growth is accurate to gestational age then that is the same thing as saying that the fetal growth is normal. ...Read more

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After the 6th or 7th week of pregnancy does the fetus double in size, causing the gestational age to be off?

After the 6th or 7th week of pregnancy does the fetus double in size, causing the gestational age to be off?

Early pregnancy: The rate of growth of the fetus in the first trimester is very rapid. An ultrasound in the first trimester has only a 3-6 day error while later in pregnancy that error grows to 3 weeks. The gestational age is more accurate in early pregnancy and less likely to be off in the first trimester. ...Read more

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Sonographer could not see fetus (only gestational sac) and said I am 5wks 2days. Do you think everything is ok with baby? Or is it just too early?

Sonographer could not see fetus (only gestational sac) and said I am 5wks 2days. Do you think everything is ok with baby?  Or is it just too early?

Very Good Question: With early ultrasound, it is now possible to see embryo heart motion as early as 6 weeks. While your concern is valid, repeating the ultrasound in 1-2 weeks will reveal the health of the pregnancy. Early pregnancy failure is a possibility I am sorry to say. However, if you do make it to 8 weeks with an embryonic heart beat, the chances of loosing the pregnancy drop dramatically to about 3%. ...Read more

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Why are fetuses measured by gestational age and not by the actual fetal age? So if u are 12wks the measurements are actually of a 10 week old fetus?

Why are fetuses measured by gestational age and not by the actual fetal age? So if u are 12wks the measurements are actually of a 10 week old fetus?

Math: Gestational age is based on your last period..The best way we can estimate fetal age....After doing thousands of measurements standards have emerged...So if you are 12 weeks and the baby is 10 weeks in size, it would indicate a smaller baby at this time...Just a way to follow growth of the baby. If I am off, i hope an OB wills set the record straight. ...Read more

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Fetus measurements: 57mm 12 weeks gestation / 62mm 12 wks+4days gestation. Are measurements this precise to have this difference in size in 4 days?

Sort of: Yes, the measurements on average do correspond to these dates and they are fairly accurate, but not exact. Also it is dependent on how the ultrasound tech measures it. So there are plenty of sources of mild error. ...Read more

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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