The concave part in the middle of the kitten's chest is the cat's sternum, also known as the cat's sternal process. It is formed by protruding from the front end of the cat's sternum. The purpose of this design is to make the cat's forelimbs move freely and have better flexibility.

Some people may misunderstand that cat sternum depression is a health problem, but in fact it is a normal physiological structure. When you touch this prominent part, you don't need to be too worried or nervous. Only when the cat's sternum is obviously prominent and accompanied by other symptoms, such as cough, vomiting, dyspnea, etc., it is necessary to take it to the vet.

If you notice that your cat has difficulty breathing or behaves abnormally, especially after activities or in hot weather, it may indicate that the cat's tolerance to temperature and exercise is affected. In this case, some changes can be taken according to the veterinary advice, such as better management of indoor temperature, less exercise and diet management.

In a word, the chest depression of a kitten is a normal cat body structure and does not need special attention. If there are other abnormal symptoms, it is recommended to seek medical advice in time.