i have it and it is not just spots they are large areas of skin that are a lighter shade then the rest of my skin. right now i have it on my arms, i hope it doesn't go further.
now, if these spots are oval shaped spots and your child has more then 1 or 2 then it might be something else, something more serious. i hate to say this and scare you, but you should be prepared when you go to the doctors. both my sons have these oval shaped spots on them. the yo has one that is on his back and is about the size of half of a dollar bill. but he only had 1. my 1yo has a small oval spot on his stomach next to his belly button. it is the size of a quarter that has been stretched out. then he has another café Ole spot up on his chest. now one spot is not a big deal but 2 or more becomes a issue. because of how many spots there are and the shape they think the baby might have tubular sclerosis (i think thats how you spell it). it is a disease that puts holes in your brain like little tubes. google it and find out about it, to many things to learn about it here. now so far it is just spots on my kid but we wait for something to happen. it probably wont but we wait. the only way to tell if he has this is a biopsy and we don't want to do that to him for something we cant change. tubular is not curable, he can have just spots and still have it or it can be worse way worse. its one of those things that they cant treat the disease they can just treat the symptoms. it might be vitaligo, or a birthmark, or something else.