He could all the sudden begin real talk out of the blue one of these days and....no more worry. All kids seem to develop speech at dif paces. When I first started the daycare I remember thinking so many of the kids I came in contact with had "issues" with speech only because my kids talked clearly and near full sentences by the age of two. BUT alot of thinkgs come into factor for this.....genetics play a role, and learned behavior can (had a child with an autistic brother, severe autism and the non-autistic brother did pick up "learned behaviors" from the autistic bro.) they also only speak as much as needed. If they have super doating parents or older sibblings to do everything for them?, they don't have to talk as much. Some kids also spend too much time with a soother, binky, deet deet, pacy....what ever....they can't talk! Just give him a little and things may begin trickling out....encourage it also..can't have the toy until you say "please"....if you want the sippy say "water"....all that helps too.