My lo has this white spots thing on his tongue? How do I remove it? Do I need to bring him to a doc?

It looks like he has oral thrush. It is caused by an overgrowth of fungus called Candida Albicans. Not to worry though as it is usually nothing serious. If the white residue cannot be rubbed off easily, it may be oral thrush instead of milk residue. Do bring him to the doctor and get an oral antifungal gel. http://sg.theasianparent.com/oral-thrush-in-babies/