Michael, what do you mean by "juvenile behavior"? I have a 6mo cockatiel, but it's hard for me to tell what might be normal " cockatiel behavior" ( this is my first one) and what might be young bird behavior.
Unfortunately he has a pretty drastic wing clip, and all he can do right now is flap and land on his tail
The breeder said he had fledged before being clipped.
He was raised around a lot of activity and is very tame already, so I have already started target training him, and I'd like to get him used to a harness as soon as possible, even if he can't fly yet.