Sorry for all the confusion. At this moment i am not worrying about what nationality I have in qatarliving.
Anyway let me write the question again.

-Baby was born in Doha when mother was on visit visa.
-When baby was 3 months old, mother and baby left Qatar.

-They again came back now on visit visa and will stay for six month. That means I have to go through medical for mother for sure. Both carry separate passport

- Now what is the procedure for baby's visa extension? Is it going to be same as mother as baby was born in Qatar.

Thanks