150+ spoken words, 20.75 mths

I updated my diary and the list of spoken words that he has been using, my list has over 150 spoken words not including the ones that i dont understand, sequence of numbers in other languages and meaningless dialogues. For the first time tonight I thought i understood the meaning of 'wat-dat', i had always thought he said 'water' but when offered a cup of water he would swat it away, in fact he was trying to say "what's that?". At the park he says 'climb up' when climbing up the stairs or the bars of the slide, he says 'weeeee' when sliding down, he knows what a slide is, he says 'more weeee','bye bye weeee' etc... Also, for the first time i showed him a flash card asking how many cows there are, he answered correctly "two cows". Amazingly he knows plurals without anyone teaching him. He knows one baby and two babies. He still doesn't kick a ball - we have already got many balls including footballs !!!