A couple of days ago my indoor/outdoor cat Duke threw up twice and has seemed fine ever since. Yesterday (01/02/15) my kitten Baelfire (approximately 4 months old) ate and threw up twice. He has not eatn or drank anything since (to my knowledge) and has been throwing up yellowish green liquid ever since. I took Baelfire to the vet this morning (01/03/15) because he was sleeping a lot more, not being his playful little self and vomiting every few hours. Vet gave him fluids, took his temp (no fever), gave him something for the nausea. He has been doing better interested in playing but not as active as usual and still not eating/drinking up no vomiting. Now two of my other cats Cooper and Billy have thrown up a few times. Duke the first cat to have thrown up a few days ago hasn't thrown up since, he is acting normal, eatinf/drinking not throwing up. Cooper and Billy have thrown up a few times today but are still active eating drinking and seem fine. I have no idea what is going on. Vet did not have much to say. I just want all the vomiting to end and my babies to get to feeling better. Any advice would be greatly appreciated. I feed my fur babies Earthborn holistic and have been using the same brand for over 2 years. I called the pet store and there is no recall. They offered to exchange it for a different bag so I will be doing that tomorrow.