It means "You are a child"
Translation: You are a child.
Avez-vous...? in French is "Do you have... ?" in English.
Vous allez! in French is "You go!" in English.
Allez-vous...? in French is "Are you going...?" in English.
Qui, vous? in French means "Who, you?" in English.
Reviendrez-vous? in French means "Will you return?" in English.
Que faites-vous? in French is "What do you do?" in English.
Parlez-vous français? in French is "Do you speak French?" in English.
Où êtes-vous? in French means "Where are you?" in English.
Que vous êtes... in French means "That you are..." in English.
Vous venez in French is "Are you coming?" or "You're coming" in English.
"How are you?" in English is Comment allez-vous? in French.
will you be ...?