Doctor insights on:
Fetus Significant Difference
Depends on interprt: The 18 wk fetus is 25% longer but 3x heavier(~3- ~10oz). ...Read more
Yes: Yes, there is a significant size difference in a baby fetus who is 18 weeks, compared to when he or she was only 14 weeks. ...Read more
There is a significant difference between a 20 weeks fetus and a 30 weeks one at the u/s? What about 13 weeks and 20 wks?
Yes, there sure is: There is an unmistakable difference between a 20-week fetus and a 30-week fetus on ultrasound scanning, just like there is an unmistakable difference between a 13-week fetus and a 20-week fetus. ...Read more
Isn't a 12 wk u/s accurate within 5-7 days? Don't the fetus measurements vary slightly and would show a difference of 11 days?
5 days either way: The error is plus or minus 5 days. So at 12 weeks the range is one of 11 days. Earlier ultrasounds are more accurate. If the ultrasound was done between 6 and 10 weeks, the error would be plus or minus 3 days for a range of 7 days. ...Read more
Yes and No: The development of the embryo (it's an embryo until the 2nd trimester, when it becomes a fetus), is on a continuum. While there are differences in organ development between 11-13w, more important difference is between 37-39 weeks. It's important to establish due date in first trimester. Management decisions at 11-13w aren't as crucial as they become at 37-40 weeks. 11-13w woman do NT screen ...Read moreSee 1 more doctor answer
About double: At 14 weeks a fetus is about 3.5" from head to butt, and around 5.5" at 18 weeks, almost twice as long. We don't measure head to toe since they are rarely stretched out like that for more than a moment. ...Read more
Yes: there is considerable development and increase in size in the 4 weeks. ...Read more
What's the difference in size between an 8 week fetus and a 12 week fetus? Is there a big difference?
Yes there: Is a substantial difference in size and the formation of extremities during the tenth week, closure of the neural tibe (spine) and facial formation among other important milestones in development. ...Read more
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
Are the measurements that precise on ultrasounds that it can show the difference between a 12wk fetus and a fetus that is 12wks and 4 days?
Do all fetuses in 1st trimester measure the same or can there be wide variation? A12 wk fetus couldn't measure 8-9 wks;too wide a difference in mm?
Early sono: Early sonograms are very accurate. The margin of error at 12 weeks would be about 5 days. A 12 week fetus would not measure 8 weeks. ...Read more
If u went for a 12 wk u/s and it showed the measurements of a 9 wk old fetus, is this enough of a difference to change the due date?
Yes: At that early stage the stated fetal age is accurate to within plus or minus five days with a 95% confidence level. ...Read more
Is there a clear difference between an 8 week 9 week and a 10 week fetus on ultrasound? Or can a 8 week fetus be mistaken for a 10 week fetus?
Sonographer skill: It is fairly easy to get an accurate fetal measurement at this gestational age. Generally there is a 3-5 day margin of error on fetal measurements at this gestational age. A skilled sonographer would be able able to accurately measure the fetus ...Read more
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
Is there that much of a difference from a 12 week old fetus compared to a 12 week + 4 day old fetus?
Not specificly: There is little visable difference.Get a more detailed answer ›
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
Would i feel any physical difference or feel ill if my immune system started to create antibodies against my fetus? 4 months pregnant and a rhesus neg
HIghly unlikely: Being anxious about the fetus is common, but you are really talking about something extremely rare especially when you do not have an autoimmune disease. Remember that maternal anxiety during pregnancy can adversely impact the health of the infant and thus you should just enjoy the experience. If the father is rh positive, you may potentially become rh positive from the pregnancy. ...Read more
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