St Pauli girl - loved the article.
Red shirting hasn't exactly effected us yet, except my hg DS 7 is asynchronous in a few areas (mostly social/emotional) and his teachers compare him to a bright boy a year older.
My friend was told by her daughter's K teacher that her daughter was behind & said she was very young (she was 5 with an August birthday). She was being compared to classmates, >80% of whom were at least 12 months older. When I mentioned this to a CST director/school psychologist she said that year doesn't matter at this age. I respectfully disagreed with her.
When my friend's daughter started reading in 1st grade it really struck me that if her Mom had held her back the teacher surely would have pegged her as gifted. She' a wonderfully normal and typically developing kid - bright but not gifted.