I added more nesting material thinking that the parents were plucking the weakest of the 4 babies because the other 3 babies were in perfect health and fully feathered. After adding the additional nesting material I removed the old nest separated the siblings and left the plucked baby with the parents. The parents are no longer plucking the baby, and are still feeding him/her. I think the baby was being bullied and the parents figured why not and took the feathers.
Anyways...what I'm asking is the baby is practically bald again. Will the feathers grown back and if so how long will it take and start to show. IS it like the baby is starting from scratch all over again?
The baby seems very healthy and strong but was just vulnerable because of the siblings bullying and wanting to be fed first. Now the plucked baby gets first dibs on feeding time

I just hope there is no scarring and the baldness is not permanent.
Please feel free to add your advice and or opinions. is what I did accurate and right?