Am I supposed to be pulling the skin back??

My son is 4 months old & uncircumcised.

My mom asked me if I was pulling the foreskin back & I told her no. She said I’m not cleaning him properly & that it’ll fuse together if I don’t. But I remember his doctor telling me not to pull it back when he was born because it’s still attached to stuff.

Am I not cleaning him right? Am I supposed to be pulling It back now??? Help??