He had two things against him in this regard. One is the lack of movement, which most of your children also share with him. Someone mentioned osteoporosis being rare in children. Actually, I guess osteoporosis would be rare in a child if it were the only thing going on with him, but I think almost every child who does not walk winds up with a problem in this regard. The other problem Nathan had was the deficiency of copper in his bones.
Copper is essential to strong bones.
Nathan's bones were eggshell-thin. He had his first fracture when he was about 4. He was lying on the floor beside me, and I wanted him on my lap. I reached over and picked him up. As I pulled him over onto my lap, his heel brushed across my leg.