car has a loud squeaking sound when i first start the car in the morning

Most likely one of the belts you replaced is loose. Check if the belts are loose. Are you starting the vehicle with the AC on? If you are , turn it off, and see if the same noise is there. If the noise is gone, the AC belt is the culprit.

Check your serpentine belt tensioner pulley, chances are that the bearing are beginning to lose lubrication from the encased grease.