Cortisol and other hormones release a surge of energy in the form of glucose (sugar), which the body can use to fight or flee. That rush of glucose is no problem if your body's insulin response is working correctly.
Notice that the kittensâ ears are just beginning to unfold, though their eyes remain closed. Their sense of smell, hearing, and taste are slowly starting to develop. Tweed is only three days old. After almost a week, the kittens begin to wiggle around on their own a little bit and their eyes start to open.
1 week-10 days: Eyes beginning to open, ears still flat. A kitten this age is smaller than your hand. 3 weeks: Eyes are fully open, ears are erect, teeth are visible. Kittens this age are just starting to walk and will be very wobbly. 4-5 weeks: Eyes have changed from blue to another color and/or kittens have begun to pounce and leap. Kittens this age will begin to eat regular cat food.