I brought the kittens I found to the vet but she just looked them over and said they were fine. I told her that one died and worried that others would too but she said just keep feeding them. The other one died very suddenly and was dehydrated but I think the 2 had genetic problems as they had crooked tails and were not putting on weight despite them eating a lot. I am worried about the last kitten as he was doing really well until recently. Seems to have trouble breathing/breathing heavily but no fever and no nasal discharge but having a hard time eating. Sometimes kitten is breathing through mouth. So maybe just a cold? At first I thought could be pneumonia but it is missing two symptoms which would be the fever and discharge. The kitten is not coughing. I have humidified the air and that helps but what else can I do while I look for a different vet?