dear Shabab,

I am very glad to hear that your son's arm is functioning as you describe.
In a number of cases, we see spontaneous healing of the arm in the first few months after birth.
If your son's arm has recuperated so well and it is hardly recognizable as such, the future should look good for him.
Is there any difference in length or circumference of his arm? Is the colour different? Is it his dominant arm/hand?
If there is any visible difference, I suggest you keep an eye on this. If you do see a change for the worse, it might be an idea
to have it checked. If you son can play and keep up with the fine motor skills needed for school work therapy should not be needed.

I wish you both well

Esther