The Land Before Time is a 1988 animated adventure film directed by Don Bluth. It follows a young dinosaur named Littlefoot who embarks on a journey to find the Great Valley, a safe haven for his species. Along the way, he meets a variety of other dinosaurs and learns important lessons
From Wikipedia
The Land Before Time is a franchise consisting of American animated adventure films centered around dinosaurs, including a theatrical movie, various straight-to-home video sequels, and a spin-off TV series. Based on an original story by Judy Freudberg and Tony Geiss and distributed by Universal Pictures, the franchise began in 1988 with the eponymous film, directed and produced by Don Bluth and executive produced by George Lucas and Steven Spielberg.