We are starting to get so much more information now:
Andrew had a short narrow snout, whereas his parents had wide, square snouts. His snout was suited to forests, but his parents would be grazing the ground in open areas.
But if adults fed their babies, why would they need to have different teeth and snouts? The researchers believe that the babies fended for themselves and were separated from the adults.
The babies most likely lived in forests in age-segregated herds, which could protect them both from predators and from being trampled by their own gigantic parents.
“I’ve been thinking of these roving bands of young Diplodocus in the forests akin to Peter Pan’s Lost Boys,” Woodruff said. “These age-segregated herds likely sought refuge in more forested areas where they could hide and be more concealed, opposed to being out in the open.”Ashley Strickland, “Rare baby dinosaur fossil is full of surprises” at CNN
That’s speculation of course, but the difference is that if evidence is in play, it’s no longer free-form speculation.
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See also: Soft tissue find shows dinosaurs had birdlike lungs