Actually, infant vomiting milk is not always caused by the wrong feeding methods. Some of the pathological factors can also lead to sick up milk, such as stomach esophagus back-streaming, pyloric spasm, congenital hypertrophic pyloric, digestive tract obstruction, infectious disease, intracranial hemorrhage and so on.aby Vomiting Milk Reasons and Solutions. After seen a breastfeeding by fresh mother, I found out the crux of baby vomiting milk, which was caused by the improper breast-feeding way. I pointed out that during the whole feeding process, there are at least 3 points which do not meet the requirements: