Hope this helps!
Stimulation and Litter Box Training
By nature, momcats lick the "back end" of their babies to stimulate the bowels and bladder on a regular basis. If you are the babies' new momcat, guess who gets this duty! After each feeding, gently rub the kitten on its low abdomen, as well as the genitals and rectum, with a cotton ball, cotton pad, or tissues moistened with warm water. Make sure you rub only enough to get them to eliminate; overstimulation will irritate the area. Keep an eye out for chafing and lingering dirt.
Kittens should (and almost always will) urinate during each stimulation. They should defecate at least once a day. One trick is to slowly count to 60 while you're stimulating a kitten; at that point, you'll know if they're done or if something's on its way out!
When kittens get to be about four weeks old, they are usually ready to experience the wonderful world of litterboxes (and you'll be liberated from stimulation duty!). After each meal, put the kitten in the box and see what transpires. If they don't get it right away, try taking its paw and showing it how to scratch in the litter. They'll catch on before you know it!
Cleaning and Flea Control
After each feeding session, you should also give them a full-body once-over with a barely damp washcloth, using short strokes like a momcat would use. This keeps their fur clean, teaches them how to groom, and gives them the attention and "mothering" they crave. Kittens will often get very dirty and mucked-up in between cleanings; it's okay to wash a kitten with warm water under a sink faucet, but try to focus only on the areas where they need it. A simple "butt-bath" will usually do the trick, but if you must get a kitten wet over more than half of its body, it's safe to dry kittens over one week old with a hair dryer set on low and used carefully, avoiding their faces.
You should also check their ears regularly for dirt and, especially after intial rescue, ear mites. Dirt can be cleaned gently with a cotton ball or swab; consult your vet if you find the telltale ear mite "coffee-ground" type dirt.
If you find fleas or flea dirt on kittens of any age, you must get them flea-free as soon as possible. Young kittens can easily get anemia from flea infestation and really endanger its life. First, use a flea comb to remove as much of the dirt and fleas from the fur as you can. Ask your vet for a flea spray that's okay to use on very young kittens; always read the warnings on any flea product to confirm at which age it is safe. Place the kitten on a towel for about 20 minutes; then discard the towel with the dead and dying fleas that have come from the kitten. After using the spray, give the kitten a bath in gentle or surgical soap.
If you donâ€™t have a safe flea spray, you can wash the kitten with a gentle dishwashing soap like Dawn or Palmolive (do not use antibacterial), or a citrus-based shampoo, and comb all of the fleas out afterwards. Make sure water temperature is lukewarm so as not to chill the kitten. Dry the kitten, if old enough, with a blow dryer or you can towel-dry it, then put it in a carrier and aim the blow dryer into it to gently dry the kitten with warm, circulating air.
Other skin irritations to look for are ringworm and mange. If a kitten is scratching excessively and there are bare patches where fur is missing, isolate the kitten from littermates and consult a vet immediately for treatment.