Infant with high lactic acid

I have a 2week old baby boy. His lactic acid keeps elevating and hasn't been normal since his birth. The lab's normal range is 2.2 his was checked two days ago and it was 14. I am feeding him breast milk and he was receiving the formal enfamil also. I have requested that he receives breastmilk only to see if his lactic acid level decreases. So far all of his tests has come back normal. The first part of his metabolic tests are normal we are waiting for the second part to return. He doesn't have any symptons. He's performing like a norma infant. He's not vomitting and he's drinking 3oz of breastmilk a feed. I am worried because everything they have tested for has returned normal. Please help. He does have asian(Japanese) in him I am not sure that has anything to do with it metabolics or not. I just want answers. I don't anything to happen to him.B