Lump on back of infant's head
I have 5 1/2 month twin girls. One of my daughter's has a small lump on the back of her head right in the middle and above her neck. It is hard and the size of a pea. She doesn't flinch when we touch it and seems to be oblivious to the lump. We are very worried and don't know if we should bring her in to her pediatrician immediately or if this is something common. She tilts her head slightly but can move her head both ways. I don't know what this could be - does anyone have any answers for me?