Goodness Sake take em out! just joking
When our broodys hatch their eggs ,by the morning the little chicks are adventuring around like pros
But I can understand you may be wary as they obviously don't have a broody mama and you don't wanna end up killing your baby's!
So I suggest just ease them in to It maybe 20-25 or even 30-50 mins a day and ease the time a little higher day by day.... the reason why our chicks (more have recently hatched under mama) adventure a lot is because we don't worry bout the heat its soo hot here!
So if its a little colder make sure they don't freeze! But if its warm and after they are used to being outside you can take them out as often as you like
Cheers , id love to see some pics