In one sentence, describe what the following article is about:

Check that the kitten has a visible waistline and that you can feel its ribs. The kitten should also seem alert and energetic, which indicates that it is within a healthy weight range.  If you are getting the kitten from a breeder, ask the breeder about the ideal weight for their particular kittens. Kittens that don’t have a defined waistline are overweight or may have parasites, and kittens with visible ribs are underweight. Seek veterinary care if your kitten falls into either of these categories. Although different personality types mean that each kitten may display different traits, the kitten should still seem inquisitive and interested in its surroundings, regardless of if it’s shy, quiet, or confident. Kittens that seem overly disinterested or lethargic may be unwell. Regardless of the breed, all kittens tend to be playful, whether they have a confident personality or not. Healthy kittens will not have runny eyes or noses. Make sure that the kitten that you pick isn’t sneezing, appears happy and well-cared for, doesn’t have any bad odors, and that its eyes are bright. If the kitten has mucus or is wheezing, it is likely to be unwell. Get the kitten treated by a veterinarian if you choose it. Look out for bare patches of missing fur or small specks of black dirt. These symptoms can indicate ringworm or fleas. A healthy kitten has a soft, full, and clean coat. Clean ears are a good indicator that the kitten is well-cared for and healthy. The ears must be clean and without any odor, discharge, or inflammation. A dirt-like buildup in the kitten’s ears can indicate parasites.

Summary:
Look for a kitten that weighs approximately 2.2–4 lb (1.00–1.81 kg) at 12 weeks. Choose a kitten that is interested in its surroundings and isn’t lethargic. Check that the kitten has a clear nose and eyes. Observe the kitten’s coat to make sure that it is healthy. Look at the kitten’s ears to make sure that they are clean.