Hi Gurpreet,
It may be too early to start chelation at this age. Ferritin of 1100 is not considered too high and you can wait for a few months before starting Chelation. Many doctors prescribe chelation either after the age of 2 or if the ferritin touches 2k.
You may start with multiple vitamins, Vitamin B, C, D etc. Please consult your doctor before starting chelation. Meanwhile you can avoid high iron food like red meat, lentils etc. This will slow down the ferritin build up in the body. However don't compromise on nutrition and protein (fish is a good option for protein), give your child high calcium food like milk, curd etc.
God Bless,
Himanshu