You can continue to feed your baby as much as you are able, and add in formula at the end of every nursing session. (romper.com)
I found she bit when she was hungrier for solids than milk and if she was really tired and almost always at the end of a nursing session. (breastfeedingmums.com)
(Tip: if you were making them switch breasts after a certain amount of time, start letting the baby decide (unlatch) when they're done with one breast and then switch sides, and / or start each nursing session on the breast they finished with the last time, so they have a chance to get all the fatty milk that usually comes at the end of a nursing session.) (romper.com)