My son doesn't turn his head to sounds...

Ju

...but her reacts to them? Like he will smile at a familiar voice or jump at a sudden sound. But he won't turn his head if you clap next to it.

He's almost 3 months old. His doctor said his hearing is fine and not to worry until 4-6 month but I am pretty nervous about it. Has anyone else dealt with this?

Picture of my little guy for fun: