When to stop feeding baby

I've never had to worry about this before because my LO has always been a light eater, but lately she is like a bottomless pit! So, advice please! Do you guys just keep feeding them until they refuse because they're full, or do you cut meals off once they've eaten a reasonable amount or a serving size or what have you... My LO currently eats three meals plus 1-2 snacks a day, so I know she is getting fed often enough, I'm thinking it's a growth spurt, I just don't want to overfeed her!