Can you bring a stroller into the museum?

Yes

Yes was there last weekend and there were tons of strollers.

Yes, but certain areas aren't stroller accessible.

Yes you can, but you can't in IMAX theater

Yes, there are a few places that you can not take the stroller like inside the planetarium, but they provide a place to put them for the duration of the show. For the general exhibit halls they are allowed.