Aaaah!!!! He has been saying it for a little while in response to me saying it, but this was the first time he has ever volunteered it himself. Wowowowow happy happy happy Mummy :) :) :)
And while I've been typing this he has made another achievement - unscrewing the lid of a water bottle, discovering it was empty and therefore screwing it back on again! Guess screw caps aren't Sam-proof any more then...
What a fantastic start to the day - love you little man :)