My DD Amber had a strawberry birthmark on her arm. I noticed a really dark red spot appearing when she was about 3 months old and thought I had pinched her in a jumpsuit. It continued to grow to about the size of a 50c piece. I took her to a specialist because it really freaked me out as it was raised and always felt very hot to touch. He told me that I could have it lasered off but it should disappear by the time she was 5. He was right, it just seemed to shrink and completely disappeared by the time she was 4.
We were so lucky that it was at the top of her arm and we could cover it up because people can be very cruel - I had someone push through a line up to come over and ask me what I had done to her, very upsetting...