What's wrong with my baby?

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Hi everyone, my baby used to sleep throughout the night. Her last feed will be at 11pm and then she'll only wakes up at 6.30am or 7am for the next feed. For the past 3-4 days she'd wakeup at 2.30am and its so hard to put her back to sleep sometimes it'll take an hour and then she'll wake at 6am again. I dont know anything about sleep regression but have heard alot about it, could this be one? What should I do?