Another word he uses is "eeee" though. Whenever he see something dirty/ scary like lizard, he will goes "eeee" and pat his chest. He look so cute when he does that. I guess he knows too which explain why he sometimes would playfully points at pictures that are black in colour and says "eee".
Another action song he knows now is "Wheel on the bus". It never fails to tickle us!
Another big achievement is going up and down the 2 to 3 steps without the need to hold on to anything.
Actually other than his speech, all his other skills are on par with kids his age.
He used to cry whenever I picked him up too but this month sees great improvement from him. No crying when he saw me, only dashed towards me and gave me a hug before looking for his bag.