formula amounts for 4 month old

Chelsea

I know folks post this quite often, but curious to see how much other babies end up eating during the day. My 4 month old is eating roughly 4 to 6 oz of formula every 3ish hours. so ending up around 790ml a day. Is this too little? I try and offer boob as much as possible too but I have a very low milk supply. :) Thanks in advance.