what is chaos syndrome
CHAOS, or Congenital High Airway Obstruction Syndrome is  a blockage of the fetusâs trachea (windpipe) or larynx (voice box). This obstruction can be due to a number of factors including narrowing of the airway (stenosis), a web-like membrane, or even an area of the trachea that is missing (atresia). While in the uterus the fetal lungs constantly produce fluid.