MR - I wouldn't necessarily see it as a disadvantage. You've obviously spent some really valuable & lovely time with your DS and helped him to develop one of life's most useful skills. Sure, when he's in grade 1 he's going to be ahead of other kids, although not necessarily all of them, chances are that others will be reading too. So what you've maybe created is a kid that will be able to help other kids with their reading, and one who will have a great deal of confidence in at least one area of schooling, which I think can only be an asset. Also, given all the fabulous time you've spent with him so far I can't imagine that you're going to just stop doing this when he goes to school - you'll still be providing him with stimulation & learning opportunities in your family environment, just as you've done so far, which will go a long way to keeping him from getting bored.