Aahhhh!!!! We Have Fleas!

Butch and Buttercup both have fleas that we just can't seem to get rid of them. I have been doing some research and bought some new flea control liquid for them. In addition, I washed them in Dawn, got them new beds, swept the house, and bought cedar chips and placed them throughout the house. It would not be so intolerable if the little buggers would stop going after my daughter. She gets HUGE welts every time a flea bites her and they itch her like crazy. Have any you had success with non-toxic flea treatments?