A: Your child has delayed milestones from a brain lesion that makes it difficult for him to easily and instantly connect to the gravity. Gravity topples him off and you have been supporting him so that he does not fall sitting, standing or walking. Your child is frightened of falling, when he cannot balance. Normally, when a child is born, he is always kept in supine position, close to the ground, which is the safest position (safety of COM); then he learns to turn over (whereby he learns to shift the COM), then he learns to sit (stabilize/control the COM), then he crawls (he can raise as well as shift the COM); then he learns to move forward and in that attempt he falls and again gets back to position.  Same thing happens repeatedly whether we are learning to sit, crawl or walk (restoration of COM).  So overall, we can say that milestone development or postural development is to maintain, control and restore the COM to safety. If you are going to keep your child in one corner just lying down, how is he going to have sight of the surrounding environment to explore and learn from it. This is one of the reasons why he becomes mentally retarded.  Human brain is a highly PLASTIC, ACTION-REACTION, and solution finder organ.  So unless it receives enough somato-sensory/visual/auditory input how do we think it is going to give its response?