Super. Just remember that whatever you go yoga asana shouldn't hurt.
Balansana, child's pose, stretches the upper back, kidneys, and adrenal glands. These muscles and organs are stretched and stimulated, so I'd think that child's pose is a potentially therapeutic asana for kidney problems.
I'm not sure sure about rabbit's pose where you start out in a gentle child's pose and then gently roll your body forward, chin to chest, crown of the head to the mat. To me, this seems to target your neck and shoulders more than your kidneys and hip area.
But double-check with your teacher.