Leaf diagnosis urgently needed!

Its really young, Unless youve overwatered it or waterlogged the roots it should be fine. If lights are close enough to overheat the plant usually the leaves close revealing the stomata underneath for better respiration (sweat). What you have looks like underoxygenation in the roots (Pics 3 and 7 from left to right). Carefully crumble the containers to let some air in the medium but make sure you dont do it too hard and end up grinding the roots agaist the perlite. If youre using Coco coir make sure it drains well underneath and never ever let it dry completely. Honestly i wouldnt worry too much, its too young to tell, give it some time before you start worrying, and make sure not to love it to death ^_^ Good luck!