size of fetus at 20 weeks gestation

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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?

Early pregnancy

Ultrasound
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.
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Dr. Anthony Filly answered:

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

Sort of

Ultrasound
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
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On the sono report it was notated "intrauterine gestation 17w 6d" is this actual fetus size? Does intrauterine gestation mean time of fetus in uterus

Yes -relax.

Open-uri20121102-27605-1v7bbe
Intrauterine means that the pregnancy is where it is supposed to be: inside your womb. The estimated gestational age is the result of measurements of the size/weight of the fetus and is pretty accurate before 20 weeks in predicting your due date. Congratulations!
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Dr. Alan Patterson answered:

20 weeks pregnant. Now my fetus is cephalic presentation.Any problem bcoz of cephalic at this early gestational age? What are the thngs i should care?

DID YOU ASK YOUR DOC

Pregnancy
u should have good communication with your doc, cephalic is normal presentation for 20 weeks but at 20 weeks it doesn't matter what the position is since if it is not cephahlic will most likely end up cepahlic a 34-36 week US is usually done in the US to check position and growth and wt that is when u want the baby to be cephalic
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Can an 8 or 9 week fetus measure 6.2cm? Or is that too big for this gestational age?

No.

Pregnancy
That is close to an 11 week fetus. Far too large for an 8-9 week gestation.
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Can 12 week dating scan be off by 2 weeks? Could a 10 week Gestational age fetus measure as big as 5.6cm?

Yes

Crown
Ultrasound scanning is related to the skill of the sonographer. Typically a 10 week scan has three days of error built in when the test is performed vaginally. There is more error with an abdominal ultrasound. Average crown rump length at ten weeks is approximately 3-4cm.
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10+-6days weeks pregnancy CRL 3.9.fhs 162.growth of fetus is acc to gestational age .is growth normal♥?

Yes

Female_health
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.
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Dr. Alan Patterson answered:

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

Same thing

Menstrual_cycle
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
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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?

12+4 weeks

Stringio
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
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Dr. Martin Raff answered:

I got laryngitis in my 4th week of gestation and took amoxicilline cap for 3 days , worried about my fetus , any harm ?

No

Amoxicillin
This antibiotic is highly unlikely to create any damage to your fetus. No drug-induced complications reported.
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