You could start leaving it cracked for an hour or two for a couple days and then remove it completly for an hour or two each day tell it gets use to that then leave the hood cracked always, and remove it completly for an hour then two per day b4 putting it back on cracked a little. Slowly get the seedling use to the elements and it will be less stressful. By the time you do this, the plant should have it's second set of leafs like Batman Skunk said.