Birth marks

My son wasn't born with a birth mark but 2 months after he was born one appeared on his right wrist on the inside, its oval everyone says because i always craved chicken nuggets when i was pregnant with him, he now has a chicken nugget on him. It really does look like a chicken nugget. Lol I'm just wondering what the chances of my daughter having a birth mark also. Sorry if this is a stupid post lol.