So, if you are raising these birds, you do need to learn. If you are buying one, don't take it home until it is on only one or two feedings a day. It is too risky to do any earlier if you have never done it before. Beware of ruthless breeders who will sell unweaned babies to unsuspecting customers at an earlier age, they want their money now and don't care what happens afterwards, which more often than not is a disaster. If you have't raised baby birds before, you are not able to tell that there is trouble until it is too late.
Baby birds have no immune system.
They are like premature human babies. This writing is mostly for breeders. Hawkheads are a little different to handfeed than other parrots, and again, they resemble caiques in this. It is best to pull them early, at ten days of age, since the parents are often not very good feeders. If you find their crops are very stuffed, put 4 parts water and one part papaya in the blender until all lquid, then carefully feed just a bit, enough to make the crop softer.