I am currently 9 weeks and five days pregnant. At 8 1/2 weeks (from LMP) I had an ultrasound that measured the baby as 25 mm. All the information I've read on the Internet suggests that this length is large for this stage. Is that true? Does this signal a problem with the baby's growth or with the pregnancy? Everything else has been normal, including seeing the heartbeat.
Here are the issues as I see them:
- You read online that 25 millimeters is bigger than 8.5 weeks, but actually that is the normal ultrasound crown-rump length for about 9 weeks gestation.
- Ultrasound is accurate give or take one week in the first trimester, so it is normal to be 9 weeks size at 8.5 weeks. That is just within the error of the measurements.
- When an embryo is found to be substantially larger than it was supposed to be in the first trimester, it always means that the dates are wrong, and the pregnancy is farther along than expected, and is not a sign of a medical problem.