How much should a 2 month old be eating?? She eats every 3-4hours. She use to go 6-7 at night but…

How much should a 2 month old be eating?? She eats every 3-4hours. She use to go 6-7 at night but not anymore. I thought maybe I wasn’t giving her enough to eat now.. but even when I give her more.. she still wants more 4 hours later. And I don’t want to be giving her more just for her to spit it up.