Personally , i see the issue of stretching and strenghtening can NOT provide the good outcome expected .
The key point is NOT the muscle ,but the behavior of the child regarding that limb ,Cortical attention toward that upper limb seems to be lost , sometimes they do NOT like that limb ....reach the level of hating it , usually they prefer using the non-affected .
Encourging them to use that limb is a social matter primarily .I begin to apply Induced constraint therapy early as possible ,i noticed great progress from the first 3 months of age .
Cheers
Emad