My ds is 18 months old. He has two older loud brothers, who take over a lot of the time! He is not saying much at all though, very rarely says mama(usually when crying but not sure if it even is mama or just a sound he's making!), he sometimes says something that sounds similar to 'thank you' when I give him something, and has said 'more' a few times too. But other than that he just points to things or kind of shouts at me to get my attention and drags me to what he wants! He understands everything. At what point should I contact nurse? They always over-react so don't want to make it an issue if he's ok. He is 18 months but looks about 2.5 so I don't know if that is makin me over-react.