Ah how we love Duplo and Lego!
All three kids enjoy building with our HUGE collection of Duplo (big toddler lego). Muski has been able to fit the blocks together and build towers since he was about 18 months old and the girls create amazingly detailed and elaborate constructions and stories to go along with them.
Duplo and lego are not cheap but they last forever and you can often find them second hand on ebay (most of our duplo is second-hand). Lego is great for developing fine motor control, not to mention spatial awareness, concepts of size, number, and colour. As well as social skills of sharing and working together, and creative expression and imagination.
All three kids have begun to play with a set of little legos that used to belong to my brother and I. Muski still hasn’t quite got the fine motor control to master the little blocks but it won’t be long till we are trade in our duplo for lego.