You should put the notes names above the notes. It would be sooo much easier for learning children. Thanks!
If I did that, the learning process would be short-circuited -- that is, I would be cheating kids of the opportunity to wrestle with the notes.
But you, the teacher or parent, can help the child write in the notes himself. It would be a one-time exercise, but still would help them each time they looked at Ode to Joy. (This little song is quickly memorized; then they won't look at the notes or note names anymore!)