I was just reading the entry about the Little Man's Vocabulary at 19 months, and thought I'd update on the situation. The Little Man underwent a language explosion shortly before his 2nd birthday. Im not sure exactly when, but I do remember the comment my father made at his birthday celebrations about how he was talking a lot more after not seeing him for more than a month (42 days +/-).
At 2.5 yrs, he is speaking in full, rather complex sentences and has been for quite a while now. I really cannot remember when he started. He talks all the time now, narrating what he is doing as he plays and making up stories.
Two stories I managed to capture:
One morning James woke up and out popped Percy and Thomas. They went to the forest and waited for Salty. And they all fell into a ditch. - 6 October 2012
One morning, Percy woke up. Out popped Gordon and went down the ramp very fast indeed and started to fall into a ditch. He landed on Percy and Percy cried. James helped all of them. - 19 October 2012
He has completely stopped signing. Up till late September/early October, he was still signing "Please" occassionally, especially when agitated, but that seems to have disappeared completely.
I'm now "Mummy". I think it was around the time he turned two. I miss the "Mama".
He understands comparative concepts, takes on different personas - Percy, James, Skarloey etc, understands cause and effect. However, his sense of the past is restricted to "just now" regardless of if it just happened or if it happened a week or more ago. He also has difficulty with the personal pronouns "me", "myself" and "I".