Short and spread out nursing, is this normal?

My babygirl is 8 weeks and these past few days she will only nurse for like 1-5 minutes at a time and is only tolerating it every 3-4 hrs. It just doesn’t feel like enough. Then she starts crying. I burp her and offer the breast again but she just cries and refuses. She used to spend 30 minutes on the breast and now it’s like she hardly wants to eat, regardless of the side or position. But she has good diaper output.

I’m just really surprised by this sudden change this last week in her nursing patterns! I know she’s getting older but such short feedings have me concerned, that can’t be enough!