The September 1st cutoff for Kindergarten is treated as a distinct milestone when it really should be treated as part of a developmental window. As far as California is concerned, if you have a kid born on September 1st, they get 2 years of Kindergarten (TK + K). If their sibling happens to be born on August 31st, they get 1 year of Kindergarten (K only). And that 1 day distinction could be the difference between a childhood of grade appropriate behavior (older, more mature) or being labeled as ADHD (younger, less mature) with many years of drug treatment to look forward to.
