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.
Newborn kittens have sealed eyelids, which begin to open around eight days. It's not at all unusual for littermates to open their eyes at different rates -- some babies may open their eyes in as little as two days while others may take as long as two weeks. However, once open, their eyes will be blue and will gradually mature. Kittens will try to avoid light for two or three days after their eyes open because their pupils aren't able to constrict. The first three weeks of kitty's life she's especially dependent on her mother. Not only are her eyes not real useful, but her hearing isn't fully developed.