I have been playing F/A for a while now, and have just noticed that when standing right beside some of my velociraptors when they hatched they didn't tame. It also did tame my deinonychus either, so I was like ok time to feed them to tame them so I started to feed them and the one velociraptor just kept eating and eating it eventually ate up about 2 stacks of beef, the hunger bar unchanged. I don't know if other dinosaurs have issues when they are being tamed on birth I just now that it is hit n miss like some dinos will get tamed. Note: I do now that you need to be closer than 6 blocks and in all my hatchings I was.