The child is capable of sitting still in the seat for the entire trip without leaning on the seat belt or pulling his knees under him.
This helps enhance the learning process and makes it more interesting for children who have a hard time sitting still for an entire story.
I have a hard time sitting still even for a moment.
If sitting still isn't your idea of fun, then hit the Conquest's miniature golf course or go for a jog on the ship's track.
When it comes to scene haircuts, if it's sitting still it's stale and pretty much over.