I have been gone for a day, and when i checked on my hatchling he/she wasnt good, major swelling, and when u pick it up and if any pressure what so ever is applied its vent opens, i have a gut feeling i am too late, any ideas, i dont wanna lose this baby

Its only 5 days old, home is perfect for heat, humidity, has 1 hide that it never uses, black rack and in a shoebox. No shed, siblings are fine.