Hi C.! You are "allowed" to do whatever you want, he is your baby. :) I had my twins at 28 weeks, and they spent 13 weeks in the NICU. I was so scared of everything the first week they were home (the week before Christmas last year, so imagine all my family wanting to have us come over). I stayed cooped up in the house with them for four months before I finally went stir crazy and had to get out. We went for an hour long walk that first time, and it felt so amazing. I also noticed that after we started taking regular walks around our neighborhood, my babies were sleeping better because they could breathe easier. From personal experience, I would say that it would be fine to take your new son for a walk. You can put him in the stroller or a sling, but just make sure that he is nice and warm (even with the nice weather that we've been having lately, it's still best to keep a light blanket over him). And if you do encounter neighbors or other people, just make sure that they know about the "look but don't touch" policy. I don't know why people think that it's okay to touch someone else's baby without permission anyways, that's just rude. And if someone can't keep their hands to themselves, then simply walk away. If they think that you are being mean by walking away, don't feel bad, just know that they were being rude first.
Your maternal instincts will tell you what is right and what is wrong for your and your baby. If you get outside and don't feel right, then head back in. If you are out for half an hour and feel that you want to stay out longer, then by all means, stay out longer. Your baby will tell you when he is ready to go in. Listen to him and listen to your heart, and you can't go wrong.
Feel free to contact me for anything else or just to talk to another adult (or preemie mom). ____@____.com
-A. Rae