'Mr Hollow Legs'

We can't seem to fill him up at the moment.

He ate all of his dinner tonight, followed by a small gown of ice cream and a tim tam and was still hungry so asked me if he could have two weet bix. He surprised me and ate both of them in no time and then asked for another two. Where does he put it all?

Here he is scoffing his second bowl full. There is no way he could be still hungry now, surely.