So my DS is 21months and he can say a fair number of words, and even attempts sentences. The problem we have is that most words are poorly pronounced (so much so that often if we don't have the context for what he is saying we simply wouldn't understand) and one of the main pronunciation issues is finishing words. i.e. Bus becomes Buh, birds becomes Birh etc. Is this normal? Can I do anything to help him improve? My DD was speaking in clear well pronounced sentences with many words at this age, so its a bit of a shock/frustration at the moment!