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Dr. Cathryn Tobin argues the terrible twos aren't a behavior problem but a critical growth phase. By age 3, toddlers' brains reach 80% of adult size. Meltdowns and play are how they build emotional regulation and problem-solving, not signs they need punishment.

Questions this episode answers

By age 3

About 80% of an adult brain

In the 1930s (by a Yale researcher, per the episode)

Dr. Cathryn Tobin

April 30, 2025

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