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.
By the time they are 2 weeks old, the eyelids and open and the kitten can begin developing their vision. Kittens are also born deaf, with sealed ear canals. By the age of 17 days, the ear canals are open and the kittens can start to hear. By 25 days, kittens will respond to sights and sounds.