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.
Kittens do not open their eyes until they reach about ten to 14 days in age, but some do open their eyes as early as 7 to 10 days. If your kitten has closed eyes, he is likely a newborn. If your kitten has already opened its eyes, she is at least a full week old.