Supplementing

Baby is almost a month old. I’ve tried (and still trying) to up my supply to start stocking up before going back to work. Nothing I’ve tried has worked and pumping maybe an extra ounce (after nursing). Looking to supplement a bottle a day with formula but still pump so I’m not losing my supply. My question is, what kind of formula are some of you using and why?

I plan on talking to his Doctor as well, just trying to get an idea. We would like to introduce prior to going back so I don’t upset his belly with a quick change.