Son threw up mostly water with some pasty yellow mucus. complained of pain in stomach, nausea, and had slight temp of 97.9. should i bring him to doc?

Persistent vomiting: worsening abdominal pain, decreased urine output or inability to maintain oral hydration are some reasons a doctor' s evaluation would be prudent. Early detection of influenza (usually presenting with fever, body aches, cough and sometimes vomiting) is important if you have an interest in using ant-flu medications such as Tamiflu (oseltamivir) because they are most effective when started within 48 hours.