VOMIT or BURP ?

These couple days Sam is vomiting his milk several times.Doctor  suspect that Sam cannot tolerate the slow bolus feeding of 50 ml where we pour down the milk within several minutes into the feeding tube. Doctor told us to cut back his milk via the slow bolus and on the other hand increase the feeding via machine.The machine enable the milk to be given to Sam very slowly and continuously. But even after we tried that, he still vomit couple times.Second suspect of the culprit : bloating tummy & the secretion in the airway. Windy weather ,that's all.After giving him red onion water , Sam seemed settle down.Tumbs up to traditional way !