To give you the best advice, I need a little more information. Please tell me:
* How old are your kittens? Kittens have different eating needs depending on their age.
* What kind of food are they eating? Kitten food is specifically formulated to meet their nutritional needs.
* How much are they eating? A general guide is 3-4 meals a day, but this can vary depending on the kitten's size and activity level.
* Have you noticed any other changes in their behavior? Are they more lethargic or playful than usual?
* Are they gaining weight or losing weight?
Once I have this information, I can give you more specific advice about whether you should be worried or not.
Remember, it's always best to err on the side of caution and consult your veterinarian if you have any concerns about your kittens' health.