A European and American movie, in which the hero found an egg and later hatched a blue dragon. Which movie is this? Seek answers.

Students go to caves to investigate and explore. A boy found something like a stone, and he took it home. His classmates also laughed at him, thinking that he regarded a broken thing as a treasure. When he got home, he cleaned up the surface soil and found that it looked like an egg, but why was it so big? He went to the library to look up information and repeatedly studied eggs. The more he looked at it, the more he thought it looked like a dinosaur egg. He told this story to the girl he liked, and the girl didn't believe it at first, until he successfully hatched the egg. It was when I came home from school one day, with a little hope, that I suddenly found that the egg had moved. Sure enough, a little dinosaur poked his head out and regarded him as his mother's intimacy. He and the girl happily hid the dinosaur at home, but the dinosaur grew too fast. Soon, there will be no room for dinosaurs in their bathtub. Neighbors are also suspicious because of the strange behavior of the students upstairs, and often hear strange cries. Finally, they called the police, and the little dinosaur was put into the zoo as a rare treasure, which attracted many tourists every day, but the protagonist could hardly see the little dinosaur, and the little dinosaur began to get sick because it didn't adapt to the environment.