first trimester scans
Weeks 7, 8, 9, 10

First Trimester

Ultrasound Sonogram

Baby developing inside you
over the weeks and months
Weeks 7, 8, 9, 10 ultrasound sonogram


First Trimester Scans

Weeks 7, 8, 9 and 10

The first trimester is months one, two, and three of your pregnancy.
Below are scan pictures taken during the early weeks of pregnancy. It is recommended that all pregnant women have a scan in the first trimester, to date the pregnancy and to see any problems there may be in the pregnancy ( low lying placenta, twins etc.).

Scans in early pregnancy are usually performed in the first trimester around 12 weeks. You may have a earlier scan, if you are experiencing pain or bleeding for example or unsure of your LMP dates.

Transabdominal ultrasound (TAU) and also the transvaginal ultrasound (TVU) are valuable diagnostic tools in obstetrics and gynecology.

Transabdominal ultrasound will provide a panoramic view of the abdomen and pelvis and is noninvasive, whereas transvaginal ultrasound provides a more limited pelvic view and requires insertion of a probe into the vagina.

While your sonographer takes measurments they will explain what you are looking at. It may not be easy for you to make out what you are seeing on the screen in the early scans. The images below will give you an idea of what can be seen and what they look for at each week; of the first trimester.

Scans for week:
 |  4  |  5  |  6  |  7  |  8  |  9  |  10  |  11  |  12  |  13  | 



7 Weeks Scans

The presence of a heartbeat is seen as a very positive sign. Details of the heart anatomy are not visible, but the atrial and ventricular compartments can sometimes be distinguished by the reciprocal [alternating] movements of the walls. The heart rate increases from 130 bpm to 160 bpm.

7 weeks 4 days
2D Scan:
  7 weeks + 4 days

With high-resolution, the heartbeat is seen as a regular flutter in the embryo, first evident at 6 weeks.

7 weeks 5 days

3D scan:
  7 week + 5 days

(crown to rump length)
CRL = 5mm to 12mm
Weight = less than 1g 

Length = less than 0.5 inch
Weight = 0.02oz

Gestational age (GA) in the first trimester is usually calculated from the fetal crown-rump length (CRL). This is the longest demonstrable length of the embryo or fetus, excluding the limbs and the yolk sac.

The correlation between CRL and GA is excellent until approximately 12 weeks. No sex or race differences are appreciable, but maternal characteristics, such as age and smoking, may have a significant effect beyond 10 week gestation. The GA estimate has a 95% confidence interval of plus or minus 6 days, and it is most accurate between 7 and 10 weeks of pregnancy.

Transabdominal ultrasonography may underestimate gestational age by an average of 1.6 days compared with transvaginal ultrasonography.

Week 7 Fetal Development



8 Weeks Scan

CRL (crown to rump length) = 16mm to 20mm
Length = 0.6 to 0.9 inch
Weight = 1g  or  0.04oz
Eight week 3D scan  
eight week ultrasound
week 8 sonogram
eight week scan
twins ultrasound

   Twins 8 week ultrasound scan
At the end of the 8th week, the elbows become obvious, the feet, hands and even the fingers maybe distinguishable. The brain cavities are easily seen as large 'holes' in the embryonic head. The heart rate has increased to 160 bpm and the heart covers about 50% of the chest area. In some cases, it is possible to recognize the fluid-filled stomach below the heart at the end of week 8.

Week 8 Fetal Development


9 Weeks Scans

During week 9, the heart rate reaches a maximum of about 175 bpm. CRL (crown to rump length) = 20mm to 30mm. Length = 0.9 to 1.2 inch.
Weight = 2g  or  0.07oz
3D Scan Week 9
9 week ultrasound

9 week 3D
Week 9 Scan
9 week scans
Week 9 Fetal Development


Week 10 Scan


CRL = 1.2 to 1.6 inch
(crown to rump length)
CRL = 31mm to 41mm

Weight = 4g  or  0.14oz

Week 10 Scan

Doppler ultrasound scan
Doppler ultrasound is a form of ultrasonography that images and examines blood flow.
The direction of blood flow is shown in different colors on the screen.
Doppler ultrasound

Twins week ten ultrasound scan
twins sonogram
 week ten ultrasonography

Tenth week 3D scans
week10 3D
Tenth week 3D scan

All of the vital organs have formed and are starting to work together.

Tiny toes and fingers are forming, tooth buds are forming inside the mouth.

...More Week 10 Development

Week 10 Fetal Development

More Ultrasound Scan Information:

Fetal growth percentile charts  |  Fetal Growth Percentile Calculator

Charts and tables for: - CRL - BPD - OFD - HC - HL - FL scan measurements.

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