6 week old slept 6 hours through the night

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My daughter is 6 weeks old as of Friday and the past 2 nights she has slept 5.5-6 hours at night. She is still only eating 4 oz through the day (every 3-4 hours) and seeming satisfied. Like she sounds full and still sometimes spits up if she like gets herself worked up or we change her diaper after a bottle. I’m worried if i should try giving her more since she’s trying to sleep more at night... any input will be helpful!