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.
The kittens' eyes will begin to open around 7-10 days of age. Do not pry open the lids for any reason, as the immature eye is not yet ready to handle light. Some kittens will take a day to open the eyes while others will take 3-4 days. The retina matures around 5 weeks of age and the kitten sees clearly.