Yes, a 4 year old child can do a puzzle and it helps develop the cognitive understanding of shapes, positions, relationships of objects in 2D and 3D space, and they are able to scan pictures, and match shapes to figure out where the pieces go.
Puzzles are an excellent choice for toddler brain development as they engage children in activity based game that strengthens their neural pathways, ones that serves as the body's communication network.
Puzzles have a fun way of strengthening the memory, sharpening the problem solving skills in a child, and can also boost moods of children as they trigger the dopamine release. They can shift brain into a deeply, relaxed, meditative state, so they can be really great natural stress relievers.
The general age is around 12-18 months where a toddler is able to complete a single or multi piece puzzles. But they are able to grasp solid objects when they are around 8-12 months old.
Absolutely! A 2 year old can play puzzles but look for knob & peg puzzles, shape sorters, 3D puzzles, as this is a great age to help them understand their surroundings, their body position, how their small muscles in hands, fingers, and wrists move while building patience in them, when they try to fit the pieces together.