4 Week Old Just Ate 5 Oz, Going On 2 More Within 1 Hour?

I’m breastfeeding, but I needed to catch up on some things so I pumped 5 oz. He gave it to her and she was a bit fussy but sleepy so I rocked her to sleep. Laid her down and she was sleep for maybe 15 minutes if that. She seems so tired and hasn’t really been to sleep since 3 and its 7 now.
Is she hungry or fighting sleep?
Isn’t 5 oz a lot for a 4 week old?

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