What would cause a child to vomit a lot one day then stop then start vomiting again 15 hours later?

A child vomiting intermittently could be experiencing a viral infection, such as a stomach virus, which can cause bouts of vomiting and then periods of relief. Other potential causes include food intolerance, a gastrointestinal obstruction, or even anxiety. If the vomiting persists or is accompanied by other concerning symptoms, such as dehydration or severe abdominal pain, it's important to consult a healthcare professional for proper evaluation and treatment.