A cat’s ears begin to stand up one week after birth, and will become fully erect in about two to three weeks. If the cat’s ears have not stood up after more than one month, it may be a cat with folded ears. After the cat's ears stand up, pay attention to ear hygiene to avoid ear mite infection. If it is a cat with folded ears, it needs to supplement nutrition to avoid malnutrition. You can feed some goat milk powder and liquid calcium in an appropriate amount, which is better absorbed.