Hi Kym, 

Thanks for the info on your son.  His relative doses don't look all that out of line (12.67 mg/m2, now; vs. 14.78 mg/m2, before), but if his bone age is delayed by almost a year and a half, and he is not growing well, I would probably still ask your doctor about a dose reduction.  Also, though both are low on the growth charts, his weight is higher, proportionately, than his height, so that is another reason to think a possible reduction in meds, may be in order.

Is your son a salt-waster?  Sodium balance can, apparently, also affect gowth.  It would be interesting to see what kind of numbers he is returning, with the meds that he is on, so, yes, pls. post them when you get them back!