9 week old - 6 hours and still sleeping! Should I be worried?

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My daughter is 9 weeks old and today has been her longest nap yet. She’s been sleeping for 6 hours and still sleeping. I fed her around 3 hours into her nap and she ate the whole 4oz while still sleeping! I’m not sure if this is normal or not? She still doesn’t sleep through the night and she maybe only got 2-4 hours last night. So maybe that’s why? But I’m not sure if I should wake her or just let her sleep