The second window of opportunity is 7.5 months after fertilization to 2 years after birth.
At birth, the brain is 350 grams, 25%, of its full adult size. At six months it is 50% of the adult size; and by two and a half 75 % of its adult size!!!
During this time, the brain is growing at 1 milligram a minute!!!
So what does this have to do with us as parents, or with referents and windows of opportunity?
Equally if not more important is a second neurological growth spurt. This does not change the number of neurons but proliferates the extent of their connectivity.
This is a major factor in determining brain weight, size, and of course function!
It starts about two and a half months before birth and continues until two years. This is a time when neurons are growing fibers and making connections by the thousands.
NOTES: Brain growth just after birth.