Okay thanks shouldnt even post on here if people are gonna be rude i have fed parakeets before not cockatiels.Why are you breeding birds when you have no clue what you're doing? Please reconsider what you're doing simply because of the tragedy that is happening right now. What are you trying to achieve?
The truth is that chick's chance of survival are low to none with your skill set and knowledge. I'm very sorry about that. You need skilled intervention by a vet.
Curse the breeder for selling an unweaned baby to an amateur.