Primo is a subtheme of Duplo that consists of 8 sets that ran from 1995 to 1996. Most sets were released in 1996 which accounted for 4 sets. As of today, the average annual growth of sets in Duplo Primo is approximately 4.9% per year.
The LEGO Duplo Primo theme, introduced in the mid-1990s, was designed for the youngest builders, typically aged 6-24 months. Key sets include "Primo Tumbler" (2091), which featured large, rounded pieces that could tumble and roll, promoting motor skills and coordination; "Primo Cannister" (2092), a storage set filled with various Primo blocks and elements for basic stacking and building; and "Medium Stack 'n' Learn Set" (2082), which included a variety of colorful, easy-to-handle pieces to encourage early learning and exploration through stacking and sorting activities. These sets were specifically created to be safe and engaging for infants and toddlers.