This study aim to evaluate the quality of fetal ultrasound in obese pregnant women. The hypotheses is that an early ultrasound will improve the quality of the ultrasound in obese.

Ultrasound examination for fetal anomaly is especially challenging in obese gravida. The foetus is more likely to have congenital anomalies and imaging in these patients is technically more difficult.

The investigators hypotheses that an earlier ultrasound with alternative technics will improve the quality and thereby improve the identification of anomalies. By using transvaginal ultrasound and abdominal ultrasound at the window just above the symphysis, were the subcutaneous fat is known to be thinner, the investigators hope to achieve a better overview. This will be done by evaluating fetal ultrasound at three different gestational ages (GA); GA 13, 15 and 21 weeks.

Inclusion Criteria:

• Age ≥ 18
• BMI ≥ 30 Kg/m2
• BMI: 18,5-25 Kg/m2
• Understand and speak Danish and thereby be able to give confirmed consent.

Exclusion Criteria:

• Multiple gestations
• Overweight (BMI: 25-29,9 Kg/m2)
• Alcohol or drug abuse
• Chronically diseases before pregnancy as diabetes, hypertension, or thyroid diseases
• Gastric bypass or other obesity related surgery

Sixty pregnant women with BMI ≥ 30 Kg/m2, 60 pregnant women with BMI ≥ 35 Kg/m2 and 60 Kg/m2 pregnant women normal weighted (BMI: 18,5-24,9 Kg/m2) will be included.

Women will be classified by their pre-pregnancy BMI and all pregnant women with an age ≥ 18 will be offered to attend the project and those who accept will be admitted. The recruitment will be performed at Holbæk Hospital and Odense University Hospital.