Out of the three presented in the OP:
Littlefoot saw his mother die, had a final talk with her, and then the movie took you through several scenes of him grieving. Bambi’s mother and Mufasa dying are sad, but neither movie lingers on their deaths before switching over to something else. The Land Before Time dwells on Littlefoot’s mom and is far more effective for it. As a kid, I could make it through her death but the scene of Littlefoot talking to that old dinosaur about it always got me.
Littlefoot saw his mother die, had a final talk with her, and then the movie took you through several scenes of him grieving. Bambi’s mother and Mufasa dying are sad, but neither movie lingers on their deaths before switching over to something else. The Land Before Time dwells on Littlefoot’s mom and is far more effective for it. As a kid, I could make it through her death but the scene of Littlefoot talking to that old dinosaur about it always got me.