HelloBaby, well, honestly, you can tell the teacher, but you run the risk of her not believing you. Your DS sounds a bit like my DS6, who is now in 1st grade. DS's teacher could tell he seemed pretty bright last year, and made comments to me about it. I also shared stories with her of what he was doing at home, but I usually wondered later whether she thought I was crazy/deluded wink. Finally, this summer, we went ahead and had him tested. He is now a DYS. The objective data is a bit easier to advocate with than my random observations.