F.M.
y son has the same problem he is a little older though he has had that problem since he was 3 I found it helpful to bring something comforting with him for him it is a bear and let him take his time going into places that have a lot of people it does help but not all the time the majority of the time it does. My son has autism which causes him toact like that and what i also find helpful is giving him a massage before it helps whith autistic children i am not sure on others hopefully i helped a little and good luck