ceramic pads

What is your question?

Hi all. Had all of the pads and rotors on my 07 Camry changed about month ago. Mechanic (good one I trust) confirmed he installed ceramic. When I brake in reverse they often squeal a bit and first thing in the morning/after sitting for the day they squeal in forward and reverse. But after a few brakes/bit of driving, the squealing reduces a lot, sometimes stops. Is this common with ceramic pads and new rotors or think something off? Thanks