Breeder said she treated all kittens in the litter since one of them had a URI. But after driving home in car and meeting us Kitten was totally stressed out!

1)What can I do to calm him down in his carrier while in the car?

2)What can I do to help him with the sneezing and coughing due to a cold?

I'm not an expert in medical conditions, therefore I'll refer you to this URL that covers URI hoping it'll help. However, my reaction would be to rush the kitten to the vet ASAP because even a cold does affect their appetite and energy negatively.

As for stressing out in carrier or car:
1) of course in your case I'd worry about treating the kitten first before addressing car and carrier stress.
2) generally speaking, its normal for a new kitten to stressout in a carrier or car. Some continue to do so, some overcome it by time.
3) for carrier issue, keep it open in the house and place toys or treats inside to associate the carrier with positive thinking.
4) for the car, I use a harness fastened to a seatbelt socket in the back seat. But this means you need to get her used to the harness first which is another process. So my advice is to have him sit in the car with the engine off and you sit next to him petting him. Once he gets relaxed start the engine, and make sure he's relaxed still. If you're not driving, you can keep him in the carrier, fastened or on your lap in the back seat at first to keep him calm during the drive. Afterwards, he'd get used to the car and noise in time. But all of this takes time...
5) vet visits are stressful due to injections... etc. so in the future associate car drivers with positive things like trip to a park, drives, road trips... etc. Do this over weeks, and don't expect fast big changes. Some cats grow not favoring car drives, but I have successfully managed to have my kitten love car drives. She goes out daily with me in the car multiple trips and she enjoys it.

But first treat her cold before worrying about the rest.

Good luck...

Did your breeder give you any medication to give to your kitty? If not, then it still has an upper respiratory infection and needs to be seen by a vet. The coughing and sneezing is not going to go away by itself! Sad that the breeder allowed this kitten to go home while it was still sick. Know, too, that this baby is stressed out to the max at having to leave the cattery and into a new home. That will just compound the issue.

Please take the kitty to your vet and have him treated. No cat loves riding in a carrier, but it is necessary to get to the vet. The sooner your baby is on the road to recovery, the sooner he will settle into his new environment. Sadly, there is no cure to keep a cat calm in a carrier. Mines yowls at the top of his lungs for the two miles we drive to our vet.

Let us know how things go.

Ive read that sneezing can be a sign of stress?
Aiko has been sneezing a bit since we bought her home, how long should i wait before i worry/take her to the vet?

Thanks, I think my little smoosh is just getting over the stress of her move but i will keep my eye out

My kitten is 15 weeks old. Was on antiobiotics for 10 days and now on a homeopathic DMG to stimulate his immunity. Still sneezing and coughing a bit. Seems congested. Today he sneezed up a big booger thick and sticky. Vet did examine him again and his lungs are clear. How long does something like this last?????

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The little monsters 3

Is she doing great now?