What to do if i have cataract in my right eye since i was a baby. iit can be replaced with another eye or something?

No: Many people have insignificant congenital cataracts. No treatment is needed for these. For significant congenital cataracts, early surgery is the best treatment. If a significant congenital cataract is not removed by age 8 or so, then there is little chance of visual improvement even with surgery.

Congenital Cataract: Congenital Cataract can cause amblyopia/lazy eye: occurs when eye does not have visual input to the brain for the connection to develop. If told have severe amblyopia, it is unlikely for a cataract surgery will give 20/20. 1st get good refraction/glasses. If VA worse than 20/40 & not due to lazy eye: surgery (new lens into eye) may improve vision. More info: eyedoc2020@blogspot.com

Depends: If the cataract was dense enough rto obstruct the vision, then removal will not improve the vision as the brain has adapted to not seeing with this eye. If the cataract is a small polar type, then vision probably has been developed and you might not even have to remove the lens. This should be discussed with an ophthalmologist to see what path would be the most favorable.