Something to make bath easier?

My LO has been using the fisher price whale tub since we came home from the hospital.  However, now that she's becoming more mobile, I'm wondering if there's some other product out there that we could switch to until she's able to sit in the tub without support?  She likes to throw her whole body into extension (so she looks like a flat board), and almost pushes herself off the little seat in the whale tub.  I'm afraid she's going to go flying down into the leg part any day now.  Any suggestions?