Class Sizes for Freshman

Hi,

My daughter is leaning towards Pitt. Are all the freshman classes big? Will she not have smaller classes until her junior or senior year?

Also, how is the writing program? She is hoping to double major in neuroscience and English with a creative writing concentration. We are also looking at Oberlin, but she is afraid that she won't like the small town. We are from just outside of Philly but she is from a small school.

Thanks for any help you can provide.