Hey! Awesome question. Congrats on the baby. I have a four month old now
I will tell you this. My wife almost killed me when I suggested taking him hiking at 1 month old.
In general I do think they suggest waiting for your first round of immunizations which I think are at the 10 or 12 week mark or something like that. That said, we definitely did stroller around up and down our street where we live, but I didn't put him in a carrier and go for a real hike or anything. If I did I probably would have kept it to 30 - 45 min, maybe a reservoir loop or something like that, since they need to eat / change / sleep so often.