Ultrasound images can provide useful information about a fetus as early as:

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Ultrasound images can provide useful information about a fetus as early as seven weeks, which is when the fetus reaches about half an inch in length and has a beating heart that can be seen on the ultrasound. At two weeks, there may not even be a visible embryo yet, and at sixteen weeks, the fetus has developed much more and is more fully formed, but important diagnostic information such as heart rate and organ development can still be seen. By six months, many important developmental milestones have passed, and the fetus is much closer to being born.

Ultrasound Images Can Provide Useful Information About a Fetus as Early