It's great you talked about how younger children--particularly babies--rarely get freckles or other birthmarks on their faces. Seeing these on a baby's face is usually a sign of skin damage, and could lead to expensive doctor's appointments if not treated properly. The same would apply to port wine stains, also known to be another variety of birthmarks. While birthmarks are mostly innocent patches of skin, some are known to actually be the cause of certain diseases so it's important to get them checked up as early as possible. While I don't have any birthmarks that I know of, getting them checked is always a good idea.