I know some of you are much quicker and better at this than I am..
I'm looking for a respectable source/research that says "75% of brain developments occur in the first 3 years of life"..
I've found websites that says that, but it would be much more powerful if we can refer it to some research or official websites (not just some baby help website)...
Anyone bored enough to help me find one?
Thanks!

