LEGO Duplo is the line every parent eventually meets — the oversized bricks designed for children too young for standard LEGO. The bricks are roughly twice the size of regular LEGO pieces in every dimension (so eight times the volume), which solves two problems at once: they're easy to grip with developing fine motor skills, and they're large enough that a child can't swallow them.
Duplo bricks are fully compatible with standard LEGO — a Duplo brick can sit on top of a regular brick or be combined with it. This isn't theoretical: LEGO produces a few "transition" sets that mix the two systems, and many families end up with Duplo and standard LEGO in the same play box once a child grows up.
The line dates from 1969 and has stayed remarkably consistent in design philosophy. Modern Duplo extends across themed sub-lines — Duplo Town for vehicles and buildings, Duplo Disney for licensed characters, Duplo Trains for motorized track sets — but the core experience is the same: simple builds, bright colors, and constant rebuilding. Most Duplo sets are designed to be assembled, taken apart, and reassembled differently many times over, rather than built once and displayed.
For gift-buying, the safe rule is: ages 1–3 means Duplo; ages 4+ means transition is fine but Duplo still works; ages 6+ means standard LEGO is now the better fit. Specific Duplo sets target different ages within that window — the box's age label is reliable.
