The Decision is Final

We are going to have our 5 year old repeat Kindergarten.  Mommy is going to get over it and then tell the boy.  My husband and I know that he will be a little upset with us at first, but we really think this will benefit him in the long run.  We are concerned about his social maturity (he is one of the youngest in his class, making the "cut-off" by just 6 weeks) and his ability to "hold it together" for a whole day.  His school offers both 1/2 day Kindergarten and full day Kindergarten.  He goes full day 2 days a week and is 1/2 day the rest of the week.  Next year we will have him go full day each day.  Right now he has a hard time holding it together in the afternoon which consists of lunch, recess, and rest time, along with some reinforcement of the week's lessons.   We are afraid that he will have trouble focusing and not melting down in 1st in the afternoon and essentially "miss" the instruction.  He's a very bright little boy which makes this harder for us and for us to explain to our family.  They don't get it.  His pediatrician doesn't either.  I have read the current body of research that states it's horrible to hold a kid back. But I haven't seen this in the kids I know that were held back. And is it better to push a child along whom is going to struggle and feel "behind" most of the time?  We think not.....and well this is one of those times we cannot know both ways.  We can only speculate....and pray we have made the best decision.....