I hesitate to call this a portrait. While it's fine as a picture of a happy young child, it really seems to me more like a 'capture the moment' snapshot than a posed image. The child seems slightly soft and both the background and the bottle in the foreground are very distracting.
What does the unedited portrait look like, for comparison? All in all, this shot doesn't look very edited, so I guess that's good. If people can tell, usually its because you've gone overboard. One thing I would like to see is some catchlights in his eyes. I think that would help.
I'd say that generally a portrait is posed.I didn't know portraits can only be posed. ;-)