This year we are doing first grade, but the public school would have him starting Kindergarten. He is just too advanced to hold back.
Don’t hold him back academically, but I would encourage you to keep him in the proper grade for his ‘future self’. Don’t dumb down his work. Many K’s are doing 1st-grade work, but come 3rd or 4th (or sometimes 9th) it becomes too difficult and they totally lose their self-worth as being ‘so smart’.
Label him the proper grade per age (we do this for kids who are behind grade level as well).
Teach at the level he is (above, at, behind grade level).
Tell him what a hard worker he is (but not that he is ‘so smart’)
Understand that he is and will continue to ‘play’ school until age 7, 8, or 9. Be a fun playmate!
When it becomes real and no longer play is when you want to make sure there are no emotional wobbles due to labels or how proud you are reflecting your advanced student.
Never keep him at full speed/challenged/at potential, but rather move forward as he sets the tone with precept upon precept and concept upon concept. Imagine if your husband said, “You are such a great wife that I expect you to work at your very best Top Notch day in and day out.” Exhausting. Overwhelming. Draining.
Usually, a child will continue to be ahead in some subjects and fall behind in others as the years go along. This is perfectly fine. Completing all subjects of a specific grade level does not give validation or credence to work accomplished. A year of math is a year of math even if only a portion of the textbook was covered. You will complete the rest of it next year (or over the summer if you school year ‘round- such a lovely and relaxing approach to schooling!)
We have always made age 6 our K year. My husband teaches in a college prep high school with tons of really bright kids who have been pushed ahead. They are able to compete in the classroom, but not on the playing field or leadership as their bodies and emotions are still at the proper age. And, it’s nice to graduate a man who is a bit more mature in age and wisdom than his peers…and we have loved having the extra year with them.