Welcome to TCS...here is the advice regarding fleas:
To remove the fleas:
Separate the kitten from it's Mother and isolate Mom until she can be treated as well. Make sure all bedding or other nesting materials are put into a securely sealed plastic bag or plastic storage tote and taken completely out of the house. Do not reuse the bedding, the plastic bag or the plastic tote if used. Get a bowl of hot water and add a drop or two of Dawn dishwashing liquid detergent. Swish it around to make a very thin layer of suds on the top of the water. Get plenty of papertowels and a fine tooth comb -- a lice nit comb is perfect on small kittens. With a DRY comb, run the teeth over the kittens and physically remove the fleas, quickly dip the comb in the soapy water, completely submersing it. Swish it around to dislodge all of the insects. Thoroughly DRY the comb with a clean paper towel each time (seal used paper towels into a plastic zip-lock type bag until you are ready to dispose of them away from the house) and repeat until there is no sign of fleas at all on the baby.
Repeat this process with the Mother cat and do not place the kitten back in with her until both have been treated, the bedding completely replaced and surrounding areas thoroughly vacuumed or mopped and dry.
Also, please make sure that mom is kept strictly indoors only until the kittens are weaned and mom is spayed. Fleas can be fatal to kittens and mom can become pregnant again as early as a few days after giving birth....so make sure the entire family is kept in a room that is 2 doors away from the outdoors.