DS2 is 3 next month. He has a fairly severe speech delay (has about 40 words now) for which we are seeing SALT.
The issue is this: DS does tend to shout a lot (either his words or just sounds). He does it when he is excited or when he is trying to get people to understand him. He seems to do it more when out & about than at home. Sadly, it makes him stand out from other DC, in a negative way. A couple of times, I have seen a child cover their ears to his shouts (both times the child was a year or two older than DS) 
Does anybody have any ideas how I could stop DS from shouting? I try to tell him there's no need to shout & also say 'shh' & put my finger to my lips, but this doesn't always work. Also, am I right in thinking this is probably linked to his speech delay?