well the doctor finally saw DS and he said that DS was fine, he couldn't really say what the lump was but he was sure it wasn't a head injury. He said if it was a head injury there would be blood coming out of DS's nose and ears (horrible image, don't even want to think about it). So Ds is back home and all snuggled up in bed. I'll Talk to Ds's doctor about it on Monday and see what he thinks. I did some googling and apparently the is a thing called a cephalohematoma which is a fluid build up under the baby's scalp, common after birth and with head moulding. Apparently its harmless and goes away on its own. Hopefully thats all it is. Wow what an exciting and scary night. Think i'll go relax with a cuppa!