Rugrats - Season 9 Episode 1

Didi watches a Dr. Lipschitz video, which basically includes a few pointers on childcare, plus an obligatory plug for more videos. Afterward, she looks at her trusty Lipschitz book, but, when she notices the book's title, ""Dr. Lipschitz A to Z, Birth to 5"", she worries about what will happen when Tommy turns 6, as, of course, that book only covers children up to 5 years of age. Thinking that using Lipschitz as a crutch would turn dangerous in the years ahead, Didi decides to enroll at a community college for classes in childhood development, with plans on eventually getting a masters degree in that field. However, when the Rugrats hears that Didi is going ""back to school"", they think that everything is going backwards, and they become more fearful of that fact when they observe Spike walking with a baby bottle in his mouth, and Stu taking Dil back to the hospital (in reality, for a checkup).