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Blocking of ears is linked to sensory processing disorder (SPD) and helps the child block out to much incoming stimuli.  It helps them self-regulated in different situations and it can at times be a sign of anxiety or a way in which they are telling you that they are feeling scared. 

Auditory Sensitivity is hugely common amongst autistics.  Some children have very specific sensitivities such as lawn-mowers and others are in general more hyper sensitive to noises in there general environment – they just hear the sounds of our world louder than most others.