Moderate: Either height or weight at or below the 3rd percentile, but not both. Mild: Either height or weight or both between the 3rd and 10th percentiles. None: Height and weight both above the 10th percentile.In the initial studies that discovered FAS, growth deficiency was a requirement for inclusion in the studies; thus, all the original people with FAS had growth deficiency as an artifact of sampling characteristics used to establish criteria for the syndrome. That is, growth deficiency is a key feature of FASD because growth deficiency was a criterion for inclusion in the study that defined FAS. This suggests growth deficiency may be less critical for understanding the disabilities of FASD than the neurobehavioral sequelae to the brain damage. Facial features
Several characteristic craniofacial abnormalities are often visible in individuals with FAS. The presence of FAS facial features indicates brain damage, although brain damage may also exist in their absence. FAS facial features (and most other visible, but non-diagnostic, deformities) are believed to be caused mainly during the 10th to 20th week of gestation.Refinements in diagnostic criteria since 1975 have yielded three distinctive and diagnostically significant facial features known to result from prenatal alcohol exposure and distinguishes FAS from other disorders with partially overlapping characteristics. The three FAS facial features are:

A smooth philtrum: The divot or groove between the nose and upper lip flattens with increased prenatal alcohol exposure. Thin vermilion: The upper lip thins with increased prenatal alcohol exposure.
Supine hypotensive syndrome

Causes
the causes for this condition are the following:
Obstruction by deep vein thrombosis or tumors (most commonly renal cell carcinoma)
Compression through external pressure by neighbouring structures or tumors, either by significantly compressing the vein or by promoting thrombosis by causing turbulence by disturbing the blood flow. This is quite common during the third trimester of pregnancy when the uterus compresses the vein in the right side position. Iatrogenic causes may be suspected in patients with a medical history of liver transplantion, vascular catheters, dialysis and other invasive procedures in the vicinity
Budd-Chiari syndrome

Diagnosis
The diagnosis can be made clinically by observing the patient when in the right sided position where you can see multiple dilated veins over abdomen due to collaterals. Ultrasound with Doppler flow measurement may be used to assess the IVC and circulatory system. Treatment
Treatment will vary depending on the cause of the vena cava compression or interruption. Often, treatment includes positional changes, avoidance of supine positioning, especially on the right side. In pregnancy, definitive management of the IVCS is to deliver the baby. In other conditions, medical or surgical treatment to remove or relieve the offending structure will relieve symptoms. Frequency
Epidemiological data is elusive owing to the wide variety of clinical presentation. In the U.S., incidence is estimated to be at 5–10 cases per 100,000 per year. Minor compression of the inferior vena cava during pregnancy is a relatively common occurrence. It is seen most commonly when women lie on their back or right side.