hmmm you could be right...but may be he does that cuz he's still a kid. I've never seen anyone through out my schooling raised here mixing up the Vs and the Ws. Anyone who went to school here if not KG even elementary school knows their Vs and Ws. But I could be wrong cuz what I just wrote is based on my experience. :)
There are those that goto good schools where English is taught as a first language in Pakistan dont mix 'em up either... It depends.. Linguistics, especially in the early part of life is a very complicated thing.