Our daughter was born with a chromosomal defect called Ring 18. During her first year, she was very hypotonic (low tone), and had poor eyesight, hearing, and sense of touch.
Some days he would just bang his head on the floor, or pick at the skin on his arms until it bled. The faintest of noises other than his own hurt his ears.
At three months, her parents abandoned her at a local hospital. At five months an orphanage took her for more than two years. Her institutional life was characterized by neglect, malnutrition, lack of nurturing, and deprivation of everything that a human being needs for well-being.
When you palpate the cranium of a brain-injured child, you may not feel any motion. Since these children can be extremely restricted, it is not surprising they have physical difficulties in life.