6 month old- so fussy and whiny. HELP!

Hi everyone. First time posting on here so here goes...

My daughter just turned 6 months. Had a great doctors visit- growing beautifully! However, I feel like she hit 6 months and has turned from content baby to fussy and whiny all the time. When playing, she’s only happy with something for a couple minutes. Even after her nap and/or being held, she just doesn’t seem content. She’s eating and