Inconsistent sleep

Morgan • hubby + daughter ♥️

Anyone else have a baby who never sleeps the same? Our bedtime routine has NEVER changed, neither has our nap time. However, one night she will sleep from 730-530 and the next night 730-1230, waking every 3 hours.

If I don’t offer the boob, she will stay up screaming. I know she isn’t hungry because some nights she goes just fine being asleep for 8-10 hours straight.

I’m so confused. What can I do ?!

(She is 6 months in two days and 13.4 lbs)