My 28 month old son's speech has developed a lot in the last couple of months. However he still says things like 'moo moo,' 'miaow' for cow, 'row row' for boat (as in row your boat) and a fire engine/ police car is a 'nee nar'.
I'm not bothered by this but always use the correct words when talking to him. DP on the other hand goes out of his way to use DS1's words ie will say 'where's your row row?' etc.
Apart from it driving me mad is there any reason why I should ask DP not to?