Tell the vet about the begging behavior so appropriate tests can be taken. My mom had an African Grey who wouldn t wean. The bird store owner who was weaning her took her to the vet. She was medicated, the problem went away, and she completed her weaning just fine. In this case, a problem occurred while the baby was in the care of an experienced person who knew the begging and weaning was going on too long, and got medical assistance.
Some birds wean quickly and some slowly.
Sometimes this is on purpose, and sometimes through ignorance. Such a child could easily have physical and behavioral problems from this. The can be even more true for a bird. The baby is hatched in the breeder s environment. He knows his breeder s face.