I've been pregnant, I've been with a 7 month old and a 5 month old. I have horrible pregnancies but I had a good time pregnant. I threw up for 9 months, but somehow I managed not to throw up in the parks. (In the hotel was a different story!) I loved going w/the 7 month old. I hated the 5 months old. Definitly much easier once the baby can sit up on their own. They your aren't having to hold on too tight.
Another thing to consider is the time of year. It looks like you'd be going in October which I think would be OK. I went in September w/the 5 month old and it was very, very hard to keep him hydrated. It was just too hot for a little one He was hot and miserable. I was miserable because he needed to be held constantly. At 7 months I could sit my dd on my lap and she was stable enough that I at least got a bit of a break. Plus we went in December and it was cold!
Another thing to consider is the time of year. It looks like you'd be going in October which I think would be OK. I went in September w/the 5 month old and it was very, very hard to keep him hydrated. It was just too hot for a little one He was hot and miserable. I was miserable because he needed to be held constantly. At 7 months I could sit my dd on my lap and she was stable enough that I at least got a bit of a break. Plus we went in December and it was cold!