Thematic Units - I Can Teach My Child! Thematic Units. A thematic unit is the culmination of all of the areas of early childhood development specifically geared towards one topic (like bugs, transportation, farm, etc). Is your little man obsessed with firetrucks? Does your dainty little girl love hunting for bugs? Have fun using the following activitiesand do it in your own time.Apples · Dr. Seuss Activities · Leaves & Pumpkins Thematic Units for Toddlers and Preschoolers: Overview and Aug 18, 2017Thematic units are topics (such as transportation, farming, and health) that are interesting to preschoolers and toddlers. If you follow the “topics” link above, you will be led to a number of topic ideas.