The appropriate age for LEGO Duplo blocks is toddlers aged 1 1/2 to 5 years, according to the manufacturer's website. These blocks are designed to be easy for younger children to handle and are larger so that children are less likely to swallow them.
A LEGO Duplo block measures two times the length, width and height of a traditional LEGO block. These toys debuted in 1969 and are manufactured in Hungary.
In addition to blocks, many LEGO Duplo sets also include figures, cars, trains or houses. Available sub-themes include the farm, airport, zoo, town, police and fire, and construction. As of July 2014, featured characters include Disney princesses, Marvel superheroes, "Star Wars," "The Lord of the Rings," "Minecraft" and "Teenage Mutant Ninja Turtles."