Ok, this is probably going to sound really dumbass but I need to know. You know people can have "birth marks", on some people this can just be a little red/brown mark and on others it can be huge like one little boy at my mum and baby group has a birth mark that looks like a ink splot and covers a lot of his face... Well... how does it happen and why? Is it if there is a traumatic birth? I haven't noticed that Ryan has a birth mark at all... So I don't get it really, how come some babies do, some babies don't, and the size and type of them vary so much..? Or is "birth mark" just a term for it and it's nothing to do with the birth?