Sleep Regression

My LO is 12 weeks old and this last week has been fighting sleep like crazy. She has actually been sleeping through the night since she was 7/8 weeks old and all of a sudden is fighting naps and bedtime. She’s been extremely fussy and falling asleep way more while breastfeeding. Has anybody else gone through the “4 month sleep regression” at 3 months? After reading about it, it seems like she’s just going through the regression early. Has this happened to anyone else?