My dd skipped 6th and is in 7th now--so far it has been a great decision. Socially no issues, she still has all As in the advanced content classes. She was in a Montessori from pre-k until 5th--if she had been in a traditional ps she would for sure have needed a skip sooner. Her friend who was already very young for grade also skipped 6th and it has been wonderful for her as well.