It's in Falls Church (near N. Arlington/FC/Mclean) but I would consider Rodef Shalom. Lots of kids aren't Jewish. They have a speech therapy option (as well as OT). It's at an additional charge but worth it. Our child gets speech there and we really like the ST. Outstanding preschool.

Could you please suggest some preschools in Arlington, VA that have very small teacher student ratios?
My DS has speech apraxia so speech services would also be great.
Thank you