I just experienced the same thing with my two cats and unfortunately a simple bath, even one with flea shampoo, won't do the trick. Most of the time those baths only kill the adult fleas and do nothing for killing the eggs, not to mention the eggs are likely located throughout your house wherever your pets sleep the most often. I brought my cats to the vet and they gave me a 3 month supply of Revolution for each cat that I have to apply, they also suggested vacuuming the entire house regularly, especially where the cats sleep. If your flea problem is especially bad you may need to flea bomb your house or have an exterminator come in. Good luck!