You can't copyright the alphabet.
You can only copyright the specific code that makes up your font, for which you need to come up with usage licensing.
You do need to register it before you ever need to go to court for infringement.
I agree that having a baby in an ad for alcohol isn't a good idea. While it may be funny to a small demographic (most of whom probably aren't drinking age yet), most people are going to find this distasteful....