We had nine pups at once, too - and all of them had fleas. I remember being overdue to have bub #1 and bathing these puppies in the sink in a little warm bath...I can't remember exactly what it was that we used, but it was some natural tea-tree based stuff we got from a pet place, I think? Mild enough for puppies, anyway. I put them in the water, gave them a good scrub down and lather up, then pulled the fleas off that hadn't come off by then one by one. In our case, their mum had rejected them and we were bottle feeding (which was soooo much fun when we had a newborn as well *twitch twitch*), so we could treat her separately anyway. But they were so much happier once all the little blood suckers were off them!

Good luck with it all...9 at once is certainly hard work