This story is part of a series that looks at what makes the 2-year-old year so critical and what could be done to better support toddlers in America. The series was produced by The Hechinger Report and Columbia Journalism School’s Teacher Project, nonprofit news organizations focused on education coverage, in partnership with Slate Magazine. Sign up for our newsletter. Or view the whole series.
See How Awe-Inspiring — And Awful — 2 Year Olds Can Be
Want to understand just how fast toddlers’ brains are developing? Watch this video.