Very easy to raise, just drop tons of stone infront of the baby. It will keep picking up stones no matter what it's weight cap is.you can fill unlimited stones like this and will never have to hand feed.
I took my argentavis and a doedicurus. Gathered as much stone as the doedi could handle (a few thousand), then dropped stacks of stone (from my inventory) a few at a time (short spoil time, be aware). A level 145 only took a few minutes this way.