Rex

Rex: A Dinosaur's Story is a 1993 Japanese film directed by Haruki Kadokawa, based on a manga written by Masanori Hata and illustrated by Clamp. The film stars Yumi Adachi as Chie, a young girl who befriends a young Tyrannosaurus rex after it hatches from an egg co-discovered by her paleontologist father.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.