Closed it’s left eye lid
My cockateil chick aged 3 weeks ++ and I still hand rearing it. Recently (past 3 days), I found that most of the time, the chick closed it’s left eye lid and leave the right one open. The chick looks healthy and consume the hand feed formula well. It had opened it’s left eye lid once awhile only.
1) What could be the reason for the symptom?
2) Any medicine/treatment for the symptom?