If the kitten's eyes arn't open, it is less than 10 days old (they open at 10 days). I just finished raising 2 week old kittens, so I can help you out. The kitten should be kept warm with towels or blanket, preferably in the house in a box or a crate with air holes. You can cover it to keep it warmer. Did you actually see fleas? Or are you just assuming it has fleas because it is a stray? If you don't see fleas, don't give it a bath now until its older. If you did see fleas, you can give it a bath (carefully-do not get anything in the eyes or nose) with a mild kitten shampoo. You should also have it checked at the vet. Many vets (around here anyway-NB Canada) will not charge you anything for the visit if they know you are helping a stray kitten. You must get a kitten bottle (like a small baby bottle) from your vet. To feed the kitten you must buy kitten formula, which has all the vitamins or make your own. I had a recipe and used some formula. It required 80 ml water, 3 egg yolks, 80 ml carnation milk, and 100ml plain yogurt. You must feed the kitten at least every 3-5 hours, this includes during the night. Don't forget to rub the kitten's belly afterward to burp them, and to wipe its face so their eyes don't get stuck shut from formula. You must also make the kitten go to the bathroom, as it is not old enough to go on its own yet. A mother cat would lick them to stimulate them to go. You can use a damp cloth or paper towel, and massage their lower stomach ad genitals to do this. It's not that difficult, kinda weird, but it will not survive if you don't. Don't forget to hold the kitten carefully and pet it. This kitten is on its own, and will need all the human contact that you can give. At this age, the kitten's survival is so-so. However, if you do all that is required and try your best, it will probably do fine. The kitten will start picking at food at around 4-5 weeks or longer. Once this happens you can reduce the bottle feeding. (At this point you will not be able to tell the sex of the kitten) Kittens at this age need a lot of care just like a human baby, so if you don't think you have the time, please try to find someone who can. Sometimes shelters have a mother cat who just had kittens who will accept another one. Don't be scared to ask you vet and other animal experts for advise. Please try to do what you can, it is worth it to try to save a life.
Please let me know if you have questions.
