Very sensitive to odors??

My ds is sensitive to odors, but not as much as your ds.
He is always asking "what's that smell"? If he wakes up during the night (usually I am at the computer snacking) he will ask me if I'm eating chocolate or chips because he can smell it on my breath, lol.
If he sleeps with me at night he tells me my breath stinks and will stay out of range of my breath, he seems genuinely disgusted. Poop smells don't bother him too much, but he will be the first to yell, "who farted"?
He's never vomited from an odor but he has gagged and vomited from mushy food textures.

Maybe you can teach him some mouth breathing techniques as he gets older.

My dd is very sensitive to odors. She has SID (sensory integration dysfunction), and--for her--it is a related issue. But I'm sure not every odor sensitive child has SID.

Dd is more off-put by artificial odors (room sprays, cologne, body lotions, etc) than PNBF (perfectly natural bodily functions ), but I would agree with your ds that poop and urine smell icky! lol. At that age, dd was still physically attached to me much of the time (I was still laying with her until she fell asleep), and I remember her complaining about my breath (even if it smelled like toothpaste) or my smell (esp if I smelled like shampoo or body products).

I think this is something that they A. become desensitized to over time and B. learn to manage. There are some wonderful advantages to a keen sense of smell!

I can remember being extremely sensitive to odors since a very young age. In fact, my first impression of people is frequently based on their smell. My high school councellor smelled like hot dogs. It was so gross. I could never bring myself to like him... And, I've usually thought (and often still do think) that my mother smells bad I know she bathes obsessively and uses every cosmetic product known to man. I'm sensitive to my own BO, too, which I'm told you're not supposed to be able to notice.

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I had a teacher in second grade who smelled like fresh peeled oranges. I loved her!!! My mom wears very strong drugstore perfumes and sometimes I can't even sit near her. Instant headache

Both my kids (ds almost 8 and dd 3) is like this. We have to be really quick with chocolate too if we are sneaking some while they are awake and elsewhere in the house - they'll sniff you out.

My kids have sensory integration issues - textures, smells, sounds, bright lights, the whole gamut. It can be challenging at times, but we have figured out ways to lesson the shock on their systems (we avoid malls, places where there is likely to be loud music, take hats and sunglasses with us, cut tags out of clothes, turn socks inside out or buy seamless ones, etc.) Oh, and we buy (or make) natural air freshner (really just alcohol and essential oils) to spray in the bathroom after someone has had a b.m. there - that and open the windows wide!

My dd (who has food aversions) will often not eat with us, as she can't stand the smell of our food , but we often talk about how she will grow into being ready to taste our meals, even though she may not be ready yet. We are working through a good book dealing with food aversions and like with all other sensory related issues, they key is to move slowly, slowly and be extremely patient as they become desensitized.