All situations are different and holding a kid back is not always a bad thing. My son has an early August birthday and we started him "on time" in Pre K. In Georgia most schools use September as the cutoff. It was obvious by the fifth grade that my son was above average intellectually and athletically. However his maturity level was lower than his classmates and he was basically the youngest kid in his grade. We made the decision to repeat the fifth grade at a new school before entering Middle School. many factors went into this and athletics was certainly on that list. These kids will be exposed to many things and we can only hope that they are mature enough to handle themselves as they grow. Among the things we considered were:
1. Last one in his class to drive (riding with others whom we may or may not know because he can't drive yet.
2. Age and maturity level when he leaves home for college.
3. being exposed to lots of influences a year earlier.
4. Dating.(The girls in his grade would have to drive him on dates)
5. Academically we felt he would be fine, but his social relationships were suffering.
6. Athletics. He could compete with the boys in his grade but what would happen as the older boys hit puberty? He was already the youngest, dad was a late bloomer, so if he was a late bloomer, then physically he may be several years behind the boys in his grade?
Lots of other thoughts as well. We held him back and all has gone great. He is happy, and I asked him this morning if he was glad and he said yes.
It will probably have no effect on his college choice, scholarships etc., but it has allowed him to be competitive in several sports and get starting/playing time that he may not have gotten otherwise. He is now in eighth grade and is succeeding in academics, sports and doing much better socially.
Bottom line, it all depends on your kid and your situation! I talked to a lot of parents before we made the decision. Lots of parents told me that they wish they had held their kids back, and I talked to several parents who had held their kids back and none regretted it.