My son also same case with yours. After 1 year old of 覆診. Doctor said that already get well, no need to take 手術. And he still keep on to follow up if you still have worry about that.
My boy is the same case as yours but he will keep on follow-up at government clinic. Doctor said that they would keep in view until 1-year old. If still did not go down, they would refer to Surgery for follow-up. No need to be so worry. Maybe he will come down himself.