More often than not, fainting is caused by lack of oxygen to the brain. Fainting is a way of the body trying to save itself. When blood or oxygen levels drop too severely, the brain shut down everything that body doesn’t need to survive so that the vital organs can use everything it needs.
Acid reflux in babies can be surprisingly common. It’s very common for babies to burp and spit up. However, if frequent vomiting is an issue, it’s worth going to a doctor about. It could be due to Gastroesophageal Reflux Disease. Otherwise known as acid reflux.