Baby finches just hatched, have some questions?

Yesterday i saw my finch eggs hatched in the nest. The parents each take turn going in and out of the nest. How do I know if they are feeding them food? Do i rely on the parents or do i feed them. I really don't want to because it would be a hel. Also what should the temperature of the room be? Its very hot out today so i covered the window so the sun wouldn't directly hit them. Please help me and give me any other additional information. Thank you so much!!!