Accuracy of dating sonograms
Big moms should read THIS FAQ first before reading the other FAQ so that they can understand the full implications of ultrasounds in general, before reading how they impact big moms in particular.
"The technology of prenatal diagnosis is usually presented to us as a solution, but it brings with it problems of its own..technology of prenatal diagnosis has changed and continues to change women's experience of pregnancy." All pregnant women in our technology-happy modern society face confusing choices about prenatal testing, its advantages and disadvantages, and its appropriateness for them.
Your baby's gender can almost always be determined by an ultrasound study after 17-18 weeks. Read more Although the parts may be present it is difficult to be accurate on gender assessment at 12 weeks.
On occasion, it can be difficult to see well enough if the baby is in a "funny" position or if you are quite obese. In the hands of a skilled tech with a high resolution probe this can sometimes be suggestive. Even then, I have seen folks who decorated a nursery based on us have to repaint when baby delivered. Read more If your doctor or technician made an error on your first tri ultrasound, then it would be possible for your edd to be wrong.
The following FAQ contains general information about ultrasounds, how they are done, types of ultrasounds available, the technology used in ultrasounds, the safety and accuracy of ultrasounds, and the justification (or lack thereof) for various indications for ultrasounds.