I need guidance about kindney stone about 1 centimeter

,of five year old kid.He is being treated according to

homeopathic medicine mainly stonil.
But ultrasound report shows no decrease in size of stone

after taking medicine for 40 days .
It is said watermelon is effective for removing

stones.But it caused pain in kidney, vomiting .
Doctor suggested operation.But child is very young and

operation might damage kidney?
What do you suggest?
Second part of my question is I read somewhere that

magnesium and vitaman b6 are effective for removing

stones ,is that true,if so in what quantity is suitable

for five year old child.
Please do answer thankyou.