There is actually a fair amount if good research that shows that for kids from an enriched home environment, a little bit of high quality pre-school is neutral, but more is harmful to social development.

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Do you have any links for this research? I'd really like to see it. I've always thought this to be the case, but didn't know there was research to back it up. I think early mandatory schooling is not a good idea. I think a lot of bullying, erratic behaviors, and an early turn-off to academics happen with early schooling. I just don't think young kids are ready. I think most kids are ready to play, learn independently (self-pace), and have some social stimulation. But forced lock-step learning before the age of 6-7, I actually don't agree with..especially for gifted kids who seem hampered by the forced learning.

Just curious if you had links...