Big boy words

Davin has been doing a little bit of baby talk (one word sentences) and pointing since Kyson was born. I guess this is normal but it was driving me crazy. One day last week was especially bad. He kept pointing into the pantry and saying "orange." No matter what I said he refused to tell me what he wanted so I walked away. He had a melt down and we went about our day. At lunch we were just talking and I told him, "Dav, you are a big boy and I know you have lots of words that you can use to tell me what you want or need." His response, "I can't. I used them all." What do I say to that!?