Are most places in DC Stroller friendly?

I wouldn't say that at all. The sidewalks and boulevards are wide and expansive. Most of the museums have ramps, elevators, and wide hallways. One point of note is that some of the pathways on the mall are gravel, so if you're pushing a stroller on those, you may want one with slightly larger wheels. That being said, we usually bring a lightweight umbrella stroller when we travel most places.

Actually, I would highly recommend bringing your stroller. DC is very much a handicapped-accessible place, and all of the government buildings and museums seem to have ramps, elevators, etc. If you are down on the Mall, there is going to be a LOT of walking if you're going to see the various monuments and such. A stroller is very much needed and can be taken practically anywhere. Even our Metro system is stroller-friendly.

I agree with Bubblace. We just moved away from the DC area and it is very stroller friendly. I used a stroller a lot there and would have had a tough time without it. You will need it if you go to the Mall and especially if you go to the zoo. The zoo is very big and there is a long walk from the metro to the zoo. I hope you have a good trip.