My Kittens Are Scratching BUt I See No Fleas....

My kittens are 4 1/2 weeks old and they scratch pretty often. Not me, themselves, like they are itching something. I have looked closely and see no fleas. I spread the hair apart where they scratch and there is nothing there. Am I just being a worrywart?
We do have other animals but they scratch from time to time and I haven't seen any fleas on them, either.

I would be vairly certain of fleas. Get a flea comb or a lice comb and see what comes out. comb against the direction of hair growth.

If not fleas perhaps dry skin or an allergy.

hi mine are scratching to mainly round there ears we have no fleas either i think it just like us we all need to have a scratch now and again ive checked them with flea comb and ive checked there ears there is nothing there

Check their ears and see if they are gunky. If so, they may have ear mites. Two of my kittens had to be treated for ear mites. It clears up pretty quickly but you will need to have a vet check them.

Yes, that is mostly where mine are scratching too, behind their ears. I will look in there (ears) to see if I can see anything.
Thanks!