Can anyone help me on advice with a possibly sick baby cockatiel?

I just asked a few minutes ago and I noticed something else. He seems like he could be chilled. Both of his older siblings have more adult feathers while he has a lot of bare spots still. Would it help if I put a heating lamp over the nest box? There is a local cockatiel breeder, should I call them and see if they are interested in it and just hand feeding it? At four weeks, how often would he have to be hand fed???? My gut tells me to just leave him alone though and like I said before, let nature decide.Can anyone help me on advice with a possibly sick baby cockatiel?
If the bird is ill, another breeder will not want to risk her own birds health. If you want to spend the money on a vet, that's fine. But at this point I don't think your bird will make it. I feed hundreds of baby birds every day, it's part of my job. When they get like this it is usually just a matter of time. Please read my profileCan anyone help me on advice with a possibly sick baby cockatiel?
there is no other option you MUST take this bird to the vet and soon. illness kills birds quickly. it's inhumane to let them sit there sick they are not humans they don't get better on their own. nature will not fix it, it will die. if you can't provide the funds for an avian vet it's time to find an adoptive home. sorry.
Yes, definitely keep it warm and TAKE IT TO THE VET!!!!