I have one baby cockatiel, one egg hatched, 3 others didn't, who is 3 weeks old today. Parents are doing a good job feeding junior, and it looks pretty big and healthy with some feathers of some sort just beginning to appear. I want the bird to be 'human friendly' but I don't want to take it out of the nest altogether and start handfeeding. Some handfeeding could be ok. How to proceed?