At 7 weeks gestation, 100,000 new brain cells are forming EVERY MINUTE in a little preborn baby*. If brain cells form that rapidly when the baby is only one inch long, think (with all your brain cells) how many more are being formed as the baby continues to grow in the weeks and months before birth. It is exponentially almost unfathomable, the number is so great. Life is truly a wonder for us to behold!
*Carlton B., Human Embryology and Developmental Biology, Toronto, Mosby Publication, 3rd edition, 2004, and other sources.