21 weeks old wakes up Every Hour at night

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Help!!! Last two nights my son wakes up every frigging hour ! I don’t know what’s going on, we are exhausted

Normally He goes to bed at 7.30-8, wakes up at 5.30. And before he’d wake up 2-3 times a night

And now it’s very hour ! Sometimes placing a paci would help, but most of the night he wants to be rocked back to sleep or fed to wake up in an hour again 😫😫😫