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Fetal swallowing is one of the main mechanisms of amniotic fluid circulation. Swallowing mechanisms were studied in 34 healthy fetuses using modern ultrasound technology. The fetal lips and mouth, as well as tongue, pharynx, larynx, trachea and esophagus were surveyed in serial sagittal planes. Fetal swallowing movements were recorded and subsequently analyzed from the videotapes. All neonates...
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