My 3 week old newborn was exposed to carbon monoxide for about 30 seconds from the stove not igniting. we could smell it while walking with him downstairs.. will this harm the baby?

Usually no worries: If a stove is supposed to ignite, and does not ignite, then one need not worry about carbon monoxide. Carbon monoxide is produced by something burning, so no ignition means nothing is burning, which means carbon monoxide is not being produced. Secondly, carbon monoxide has no odor, which means nobody can smell carbon monoxide. If you smell it, it is something other than carbon monoxide.