Hello Pareshdas, how long your little one is on Kelfer and Desirox? Kelfer is known to take out the iron through the renal tracts, while Desirox uses the intestinal tract. This means the Excretion by the reanl tracts will be colored like rust, the excretion of the intestinal trakt is more a dark brown. Both can change dayly, depending what you will give to eat and how much to drink. There are also some natural products helping to eliminate the excess of iron in the body. One of them is Spirulina.
Hope it could help.
God bless you