My daughter has a port wine like stain on her left leg from the knee down. We see a birthmark specialist in NYC. Hers was not present at birth, rather started showing up around 2 months of age. If you are worried, take her to be seen. You can also email pictures to a specialist (we see Dr. Waner in NYC).
My email is firstname.lastname@example.org
if you have any questions. Try not to google too much and assume things. I spent hours and hours looking up pictures of CMTC and KT children and crying my eyes out. Not everything ends up horrible and bad like you see online.