My kids are both midwinter birthdays, so this isn't a question for us. However, I have always thought the whole redshirting trend was not a good one, and have seen it cause issues in DD's class. That said, there were two studies recently showing that simply being young for grade dramatically increases a child's chance of being diagnosed with ADHD. That's a huge problem, and if I had a squirrelly child who was going to be young for grade, I'd feel forced to consider the possibility that someone was going to try to slap on that label even when not warranted.