Through the use of technology, keeping up with your pregnancy with the use of 3D ultrasound pregnancy scans makes the experience of pregnancy much more fulfilling- for both mom and dad. Expectant mothers and fathers have, in the past, had to go through the pregnancy experience without the use of high resolution scans that allow them to see detailed three and four dimensional photos and videos from the womb. Now that this is possible, you can see the wonders of the things that go on during pregnancy. As early as about 8 weeks along in the pregnancy, you can use these scans to see things such as leg and arm movement, including kicking and waving. Once you get to about 10 weeks, these leg and arm movements become much more agile. As they begin to have better movement, you will be able to get a more clear picture of the baby. These are all things that you can see during the first trimester.
Source: 4D Ultrasound Blog