I was wondering if your son's feeding tube healed?
I had one for most of my life and mine fell out last december. I chose to not have it replaced cause I didn't use it anymore and mine still hasn't healed all the way. The hole closed almost all the way up, but I still have a almost constant leak of stomache contents.
I am sorry I do not know anything about gastronomy feeding tubes ...I am uncertain if there is an expert forum will cover this, try the nurses forum ..Good Luck to you