Zahra,
Usually iron doesn't get very high before two years of age,and yes doctors do say here that wait till ferritin reaches 1000,chelation is usually started when kids turn two,i know only one person who started her son on chelation when he was 18 months,our moderator Sharmin,she started her son on chelation when he was 18 months old,but she started with desferal,exjade wasn't available at that time i guess,so if you start chelation early wait atleast when he turns 18 months and then you can start him on desferal for six months until he turns two and is ready to try exjade,i won't feel comfortable starting kid of your son's age on exjade,but on the other hand starting chelation early is a good idea,but if you don't mind needle pricks.
Zaini.