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I actually have a friend with a baby Joshua (around a year) who is very clear that he's Joshua, not Josh. My impression is that you won't be able to avoid having to correct people or working to discourage the nickname, but you can still quickly get people used to using only the full name. What the kid might choose for himself when he's older of course you have no control over. I'd say if you like Joshua enough it's worth it, but if you have other options you like you might find it more than you want to deal with.