I've noticed that in the 9th movie, Littlefoot's voice sounded deeper and more grown up (particularly when he sang) and in 10th, 11th, and 12th film hiss voice sounded a lot older as well. But in the TV series, his voice was younger again. Plus Cera, Ducky, and Spike are starting to sound more grown-up than him. So I've been thinking maybe there should be a film where Littlefoot hits puberty and learns that it's perfectly natural. What do you guys think?