My 8lb 2 month old baby just ate a 5.5oz bottle 😳

Seriously, I don't know where she puts it. She usually eats 3.5oz, but at her 4pm feeding she was hungry! I gave her a 4oz bottle, and she finished it and whined for more. I burped her and gave her a binky and waited a bit. She still wanted more, so I poured in 2 more ounces thinking she'd only take a couple more gulps. Nope, she polished off another 1.5oz, spit it out, and fell asleep. I would be worried, but she's only in the 2-percentile (she was born small) so I don't think she can get overweight anytime soon. Anyone else have some crazy big eaters lately?