The pillow will only harm the baby if he sleeps on it, the mold can definately be harmful if not kept under control.
The mold can be dangerous, get actual mold remover/cleaner from somewhere like home depot. Then have your bf paint over it with mold resistant paint.
I've also noticed peroxide helps with mold. You could was the pillow and let it outside to air dry
I agree also they have this little boxes with beads in them that soke up moisture you can get them at the dollar store for like 4 dollars they work well I would buy two!!!!!! I forget what they are called I forget every thing now I can barley spell lol
You should look into a hypoallergenic pillow case and wash the walls with vinegar it works wonders!