It is just 4-5 inch high. It is under morning sun and under a chair avoid afternoon sun but its some leaves still got burn.  I cannot put it into my house it has AC.

P.S. it is potted in bottle as container on decking.

How?

Can you drape something over the chair to give it a little more protection?  Or maybe pick up a small sheet of shade cloth and drape that over the chair?

Also...unles you keep your house really cold...the little tree should survive indoors near a window.  

Put it under decking and let it enjoy 4-hour morning sun and get cool afternoon. Hope it works.

Sounds like a good plan.  My newly potted cuttings get something like that under our front porch overhang.   

Good luck with your tree.