my son having right side testis..but don't have left side..now my boy is 3 month old..when left side testis will come

A. Hi Sometimes the testicles of the child is not descended properly maybe that’s the only case as of now you’ll have to get a check with your doctor and if it is not there from the time of birth only that it is not going to be there but most of the cases it is not descended which is why it looks like this