I've read about this in many places and teachers have commented about this. A parent will complain little Johnny is bored and when teacher looks at Johnny's birthdate, he should be in 1st and not K. I spoke with a mom, whom from what she said, he was at the very least high avg if not brighter. Well, she kept him out of K b/c of his short stature. Another kid was already reading and doing simple math, parent planned to hold the kid back b/c of a November birthday (cutoff is Dec) not considering whether emotionally, psychologically, and academically the child was ready.