10 points: Why is my kitten eating less?

Cats do eat less as they get older. The measurement guide for the kitten food I fed my kitten shows less food at 7 months and older than it does for 4 to 6 months. Does the kitten still look good and seem active (when he's not sleeping) and healthy? If so, I wouldn't worry about it, especially since he was just at the vet. Adult cats sleep 70% of the time.