This is something that TV Tropes pointed out. Apparently the scene in the original where Ducky meets Spike has a subtle adult joke. I don't feel comfortable describing what I'm referring to so I'll let TV Tropes explain it: https://tvtropes.org/pmwiki/pmwiki.php/Funny/TheLandBeforeTime.
Now that I’ve figured out what Ducky was doing when Spike hatched all along, I’m going to
notice the part every time I rewatch the movie.