a. Symptoms of Atresia Resulting In Upper Espophageal Blind Pouch-
Frothy White Mucous Oral Secretions: The infant though is able to swallow at first normally, however there appears a kind of tiny, frothy and white color mucus bubbles in the mouth and sometimes also in the nose.

Regurgitation of Content From Pouch: This happens due to the reflux and regurgitation of the ingested content, which is unable to pass beyond the esophageal pouch. The ingested milk or liquid is often mixed with mucous secretions.

b. Symptoms of Atresia Associated With Tracheal Fistula Connected With Upper Espophageal Blind Pouch-
Frothy Secretions: Fistula is a tubular connection between trachea and esophagus. The air from trachea passes through fistula into upper end of the esophagus and pouch. The frothy mucosal secretion is observed in mouth and nose. The secretion becomes frothy because the trapped milk and liquid in pouch is mixed with air transmitted from trachea.
   
Rattling Breathing: There may be a kind of rattling breathing sound heard in the baby's chest, especially while drinking. Rattling sound occurs because of air transmission through fistula while fistula is filled with esophageal secretions. Rattling sound is also caused by inflammation and edema of bronchioli.
   
Coughing and Choking: The noisy breathing is also accompanied by coughing and choking. The liquid passes from esophagus to trachea through fistula. The presence of liquid in trachea causes cough and choking.

Short of Breath and Dyspnoea: Difficulty breathing starts appearing when liquid passes from esophagus to trachea through tracheo-esophageal fistula. Short of breath is caused when baby is struggling to breath. The inflammation of bronchioli and alveoli (lungs) caused by esophageal secretions in lungs results in swelling of smaller air passages (bronchioli). The bronchiolar mucosal edema or swelling causes difficulties in air transmission to alveoli or lung, which results in dyspnea or difficult breathing. Child tries to take deep breath each time child inhales air.
   
Cyanosis: Cyanosis is caused by low blood oxygen. The secretion from esophagus enter into trachea through fistula and secretions spreads over the inner surface of lung or alveoli. The esophageal and gastric secretions causing bronchial and alveolar spasm, swelling and inflammation interferes with oxygen exchanged.

c. Symptoms of Atresia Associated With Upper Espophageal Blind Pouch and Fistula of Lower Esophageal Pouch –

Frothy White Mucous Oral Secretions- The frothy secretions are observed in mouth and nasal passsages.

Regurgitation of Content From Pouch- Frequent regurgitation of milk or liquid is observed.

Frequent Coughing- Symptom is caused by gastric secretion that passes through the fistula into trachea.

Rattling Breathing- The gastic secretion causes bronchiolar inflammation and swelling resisting passage of air to alveoli.

Short of Breath and Dyspnea- The low oxygen saturation in blood causes strenuous breathing.