I am not pro-acceleration at all as I declined it for DS11 back in 2nd grade. However, it seems obscene to me to actually hold back a kid that will turn 5 three months before what is arguably an early (but increasingly common) cutoff of September. There is an advantage of dealing with social problems earlier rather than later. Interestingly, that is one of the arguments in favor of preschool and pre-k at least from some teachers' perspective in dealing with K students.