3 week old over eating

My 3week old I think is over eating. This week he went from 4oz every 2.5 hrs to 5oz and is now still showing signs of wanting even more. Yesterday was the first day he actually spit up from over feeding (7oz) . Every time he is rooting and showing hunger signs so I know the cries are for food but I know he doesn't need this much. What can I do to make him chill off eating so much. We have tried singing, dancing & the pacifier which he spits out when he realizes no milk is coming. Any advice would be appreciated