My doctor has pointed out that DD, who's only 4 months old, has 4 cafe au lait marks on her, 3 on her side and 1 on her thigh. We've been told to keep an eye on them and that if more than 5 or 6 develop this could indicate neurofibromatosis. There's no history of this in either my or DH families. Do these marks often develop into neurofibromatosis. I'm really worried. Can she have cafe au lait marks and nothing develop beyond them being a birthmark? She seems perfectly fine and normal but I'm now constantly looking for signs of something being wrong with her. Anyone else with experience of this?