DTV extension / cheang wattana

Hello

I have a DTV remote worker. I recently give birth and have the Thai birth certificate (non Thai) and still don't have the passport for my new born + hospital bills + coming appointments (vaccine etc)... I would like to avoid to have to do a border run and wonder if anyone went to chaeng wattana asking what they require to extend ? I can produce up to date docs for the visa + all the documents above explaining why the extension would really be helpful... Anyone has any experience with chaeng wattana / cases when border run isn't convenient at all?

Thanks and happy songkran all!