So first of all this tame is much easier with two people. First thing to do is get the parent away from the nest/baby with fert eggs we used giga eggs and once you do have the second person stand on top of it with a Rhynio or anything like that to get it stuck. Once the second person is standing on it you go into the nest and tame the baby. Make sure the baby stays away from the parent because if they get to close the parents will agro. Lastly if the parent agros the only way to get it to stop and keep it away from the nest is to knock it out and let it wake up again otherwise you will have to go in and out of render until they de agro