I do not think that it would hurt anything by having as much information as possible. It may be that your doctor is correct, but then again by getting a second opinion it could only help you feel better and in turn help your son also.
Hello~I think if it were my son, I would have a specialist check out this issue. Since your son is so young and his body trying to get a good start in life, he needs the best advice and care he can receive, and yes, I strongly feel it should be monitored.