Forming questions

Jon, 

There are several ways to ask questions in French. 

See attached link for simple questions, such as this example.  

https://progress.lawlessfrench.com/revision/grammar/three-simple-ways-to-ask-yes-no-questionsintonation-est-ce-que-nest-pas

Also, using subject-verb inversion (avez-vous) tends to be more formal than a statement framed as a question (vous avez faim ?) so the second is more likely for someone addressing children.