I read the article with interest and have to comment about my oldest daughter's experience ( she is now 26).
She was checked individually by the local school's psychologist and we were told we should consider holding her back. She told us her fine motor skills were very poor. We knew she was bright, and didn't really think she had a problem with her skills, so thankfully we enrolled her.
In second grade she was indentified as gifted; She was involved in sports at an early age (softball, soccer, gymnastics) and in her sophomore year of high school she was the starting 3rd baseman on varsity softball team. She graduated as valedictorian of her class and is now a successful professional iving in the DC area.
Hopefully this info will help somone else.

Children can be hurt by being put forward, too. I was born in January, so didn't fit perfectly into the school year. I was put into kindergarten with older kids because I was already reading. Yes, I was intellectually ready for school, but not emotionally ready for that school. Seen as vulnerable, I was bullied mercilessly. My only friend was in the grade below me, the one I should probably have been in.