Emily Oster emphasizes the importance of using data to make informed parenting decisions. She challenges conventional wisdom and provides evidence-based insights, helping parents navigate the plethora of advice they receive. This approach allows parents to make choices that are best suited to their individual circumstances, rather than following one-size-fits-all rules.

"Cribsheet" tackles and debunks several common parenting myths. For instance, Oster explains that breastfeeding, while beneficial, is not a cure-all solution. She also addresses misconceptions about sleep training, showing that it is not as harmful as some believe. By dispelling these myths, the book helps parents feel more confident and less guilty about their choices.

One of the key themes in "Cribsheet" is the importance of maintaining a balance between parenting and personal life. Oster provides practical advice on how to manage work, relationships, and self-care while raising young children. This holistic approach ensures that parents do not lose themselves in the process of parenting and can enjoy a more relaxed and fulfilling experience.