He's not terribly good at it yet. He chews on the spout for a bit and then does a big suck and dribbles most of the water down his chin. When he does remember to swallow he pulls the spout out of his mouth and looks into the distance thoughfully until his is ready for another mouthful. It is very entertaining!
He has also started charging around his cot at night. When we come in in the morning, he is often at right angles to where we put him down and in an entirely different bit of cot. He's always jolly though!