Acid reflux can cause your baby’s symptoms (cough, trouble nursing, can’t breathe properly, better sleep when sit than on back…) but a respiratory infection (upper or lower) can also cause the same symptoms. Phlegm produced by the respiratory infection can provoke the vomiting-reflex when stuck in the throat. Phlegm especially sticks in the throat when baby lies on its back. You may want to consult a pediatrician about your baby’s problem.
To the administrator:
If “deviated septum” refers to deviated NASAL septum I can tell this:
Deviated nasal septum disturbs the phlegm drainage from the nasal cavity (sinuses are not developed yet in babies) and makes the nasal mucosa more susceptible for upper respiratory infections. As I said before, upper respiratory infections can provoke vomiting.