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Thank you for your question about Buster. My name is Rebecca. I am a veterinarian and will do my best to help.
Going up and down stairs should not affect the development of the joints. If he has a genetic condition like elbow or hip dysplasia, that is already there and the stairs will not make this worse or better. If he has healthy joints, then exercise and strengthening of muscle is good for him. I would avoid forced exercise, making him do anything he is not wanting to do.
He is still pretty young, so I might help him out if it is a struggle for him, but in a few weeks if he is going up and down the stairs with no problem, let him. If he stops and acts like he does not want to do the stairs yet, then carry him.
The exercise that is not recommended is taking a puppy jogging and "fence running": chasing another dog or people back and forth along a fence. I did some searching and did not find anything about not doing a couple of flights of stairs, if the puppy is not hesitant or reluctant.
Let me know if this helps and what else I can answer.
I hope you were able to see what I wrote. Please let me know if this is helpful and what other of your questions I can answer.
How is Buster doing? Can I answer any other questions?