Hi guys, my 2 year old boy has a faint birthmark in the middle of his back with dark hair growing all over it. Its about 1.5 inch in size and has been there since birth. His father has the same on his wrist and his grandfather has the same on his back, i wouldnt normally worry but there are other issues. My boy is still not talking, not a word! He understands everything i say which is why i dont think its a hearing problem, he also likes to walk on his toes (when not in shoes) . The worrier in me is thinking is this just normal lazy boys with his speech, he has 2 older siblings who talk for him..... or is it neurological?