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In this episode, I’m looking at when cognitive development actually begins. The short answer: months before birth.

There’s a specific timeline that plays out in the womb. At three to four weeks, the neural tube forms. By five weeks, basic brain regions are taking shape. Between six and twenty-four weeks, neurons migrate to their precise locations. The cortex starts forming its six layers around eight weeks, but stays smooth until the third trimester, when it rapidly folds to fit inside the skull.

While this structural development is happening, the fetus is also starting to process information. By the third trimester, there are sleep-wake cycles. Fetuses respond to stimulation and show habituation, which means they get bored with repeated sounds. That requires forming simple memories. They also learn statistical patterns from the language their mother speaks, which is why newborns prefer their mother’s voice right after birth.

I also look at what happens when this timeline is disrupted. Premature birth, pregnancy complications, and problems with cortical folding all affect cognitive outcomes years later. The point is straightforward: the cognitive abilities you use every day depend on developmental processes that started before you were born.

🎧 Listen to the episode titled: When Does Cognitive Development Really Start?

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(February 24th, 2026)