It is common for babies to spit up a few times a day. But if a child often vomits, it can lead to other problems or symptoms.
Frequent spitting up or vomiting in children is often due to acid reflux, also called gastroesophageal reflux disease (GERD). It can happen to infants as well as older children.
http://www.thejakartapost.com/life/2016/08/25/what-to-know-about-acid-reflux-in-children.html
What to know about acid reflux in children