18mths still not saying any proper words

[DaddyCool]

I'm sure things like this have been done to death but my 18mth DS is still just babbling (constantly) so we get dadada babababa wawawaa nanananan, diediedie (that one's a bit concerning!) but no real words and nothing that kind of sounds like a proper word. He mostly just squeals and points at things.

Anyone had the same thing? Reason for concern?

Forgot to add that my 23mth-old has started to use words within the last couple of weeks and he too pronounces them with the wrong consonants, eg "dain" = train, "gee" = green, "boo" = blue etc.

My son was similar at that age - turned out to be due to impaired hearing due to chronic glue ear. If you are worried you can ask your health visitor to arrange a hearing test...you can also try a few things at home - talking quietly to him when he is facing the other way and see if he hears you..asking him to do something simple whilst covering your mouth (my 2 year old was a fantastic lip reader!)
Ds had grommits fitted eventually, and his speech improved dramatically.