2002 Nissan Pathfinder Belt Squeals

One of my belts on my 2002 Nissan Pathfinder began to squeal when I start the car about two months ago. It only happens at startup and its periodic. Because of that, I recently replaced both my a/c and altenator belts with original equipment from Nissan but it continues to to it. Any idea why? Perhaps, there's a bigger problem than the belts?

Any insight you provide is appreciated!