Duplo is great. The blocks are mostly big, so they cannot be swallowed. You can literally stomp on a block with all your power and it will not break. You have r

Duplo is great. The blocks are mostly big, so they cannot be swallowed. You can literally stomp on a block with all your power and it will not break. You have regular blocks but also trains, rails, wheels etc. * My youngest at 6 months was happy for ~10 minutes just holding a red 4 x 2 block * Now he's 10 months old and licks the blocks and bangs them together * My oldest at 1 - 1.5 years old, tried to stack a few blocks together * At 2 years old he was building large towers, to collapse them * At 3 years old, I could build something for him and he could "help" and add stuff to the building (with fantasy running wild; stack 20 random blocks on top of a carwash I intricately crafted and that was so "planes could land to be washed") * At 4 years old, he could build stuff by himself * Now at 4.5 he's learning himself how to reinforce structures, how to build "bridges", build cars etc.