I COMPLETELY agree. Child directed speech is definitely about speaking a level above what the child is at, and not a level below. It is about recognising their natural gap between Expressive Communication and Receptive Communication, and aiming to communicate with them on a level of their Receptive Communication, and not below where their Expressive communication is currently at. Some children have a huge gap between receptive & expressive communication, and some have a relatively smaller gap. This is related to the child's Zone of Proximal Development... but I am digressing (sorry, I get way too passionate about language acquisition!) The point is... I agree with you! It drives me nuts when someone says to a four year old, 'Ta for a dwinkie winkie?'