My Son's Urine Has Pinkish Orange On His Diaper..so His

My son's urine has pinkish orange on his diaper..so his pedia adviced us to test his urine. And the result was he has few calcium oxalate in his urine. Btw, my son is only 4 months old..and he is breastfeed baby..is it possible that if he takes water to flash out those crystals in his urine? Thanks doc in advance..im so worried about my son :(