Most of the brain's roughly 100 billion brain cells were formed before birth.
Sources
- The book of neurogenesis (health.harvard.edu)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC11526699/ (pmc.ncbi.nlm.nih.gov)
- https://pressbooks.cuny.edu/psy320/chapter/stages-of-neuronal-development/ (pressbooks.cuny.edu)
- https://www.zerotothree.org/resource/good-question/when-is-the-brain-fully-developed/ (zerotothree.org)
- https://www.science.org/doi/10.1126/sciadv.adg3754 (science.org)
- https://www.psychologytoday.com/us/basics/neuroscience/how-the-brain-develops (psychologytoday.com)
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