6month old baby was left hand erbs palcy.recovered fully at 3 month. now left hand is more active than right(( can i stop rom exercises?

Maybe: This is a decision probably best made by your following doc and therapist. What you see as "more active" use may be a problem. If they agree recovery is complete they will likely change your treatment.

Advise discuss w doc: Decision to terminate ROM exercise should be made with doctor who initially prescribed therapy.

Mgt: The condition has improved and your PCP can determine whether you still need to do this. From your description, it has improved.