It's birthday season in the Busby house! As the Quints turn four, Riley navigates her first day of Pre-K, Hazel adjusts to her big girl glasses, and the girls say goodbye to nighttime diapers. Adam's new job means major stress for Danielle.

Adam and Danielle want the girls eating healthier; the Busby's get surprising news about their house; Danielle dives into her new business.

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As the Quints prepare for end-of-the-year testing to determine their class placement next year, fears of Parker's anxiety returns.

It's Adam's birthday and the family is celebrating with a weekend trip to a Dude Ranch; the Busby's must make a difficult decision about the girls' schooling.

The Busbys have become experts on parenting quintuplets, and are ready to teach the world. Through never-before seen moments, insight from the girls themselves, and advice on what to do and not do, this is a crash course on all things raising Quints.