Cravings = birth marks on the baby!

Manal • Soon to be a mommy of 3 under 3
Where I'm from they say whatever you crave you should eat while pregnant or else a birth mark will be on your baby..also they say that if you are craving something & you can't get it right away,avoid touching your face,instead scratch your bum because you don't want your child to have that birth mark on his/her face?!
​I used to go to school with a boy who had a big red mark on his face,he said his mom told him she was craving watermelon! 
​I have a brownish birth mark on my inner thigh,mom said she was craving sweet potatoes?!?! 
​Do you believe in this? Is there any birth makes old wives takes where you come from?