If your hamster's bedding becomes too dirty or smells bad within 13 days, consider changing the bedding. How often you need to change the bedding depends on factors such as the amount of activity and size of your hamster in the cage, the size of the cage and ventilation. It is usually recommended to change the litter once a week to keep the cage clean and hygienic.
When changing the bedding, you can temporarily place the little hamster in another cage or in a safe place place, then take out the old bedding, clean the bottom of the cage, and then place new bedding. The bedding material can be paper or wood chips, but you need to be careful not to use toxic or irritating materials to avoid affecting the health of the hamster. After changing the litter, you can observe whether the hamster has any abnormal reactions or discomfort. If there are any abnormalities, you should seek medical treatment in time.