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.
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.