Spotting

Description:

Please help me with identification of this bird urgently. I have found this baby bird today only. I think it is either Indian Swallow or Indian Swiftlet but I don't know for sure. It is not able to fly yet and is a little bit afraid of me. I want to know what do these birds eat so that I can feed him/her.

Habitat:

Hauz Khas, New Delhi, India