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.
Around week 5, a kitten can see clearly. Again, if the eyes are ever red, swollen, have discharge or appear cloudy, take the kitten to the vet immediately. Additional milestones in kitten development include the development of hearing around 4 weeks of age. The ears have been open for 2 weeks already, but it take 2 more weeks for hearing to become acute. Deafness is possible, especially in white cats with 2 blue eyes.